In the system 4x + 9y = 7 and and 4x - 9y = 9, would I add or subtract this system to solve for x? To solve for y?
add to solve for x or add to solve for y
subtract to solve for x or subtract to solve for y
add to solve for x and subtract to solve for y
subtract to solve for x and add to solve for y
Answers
Answer:
add to solve for x and subtract to solve for y
Step-by-step explanation:
To solve for any variable, it is required to eliminate the other variable in two variable - two equation set.
The set of equations are
4x + 9y = 7 __________1
4x - 9y = 9 ___________2
To solve for x we need to eliminate Y
We see that in equation 1 there is 9y and
in equation 2 there is -9y
if we add 9y and -9y (9y -9y = 0)
Hence it is clear that to solve for x , it is needed to add equation 1 and equation 2.
by adding equation 1 + equation 2 we have
4x + 9y = 7 __________1
=> 4x - 9y = 9 ___________2
=>4x + 9y + 4x -9y = 7 +9
=>8x = 16
=>x = 16/8 = 2
____________________________
To solve for y we need to eliminate x
We see that in equation 1 there is 4x and
in equation 2 also there is 4x
if we subtract 4x and 4x (4x -4x= 0) , we get 0
Hence it is clear that to solve for y , it is needed to subtract equation 2 from equation 1.
by performing equation 1 - equation 2 we have
4x + 9y = 7 __________1
=> 4x - 9y = 9 ___________2
=>4x + 9y -( 4x -9y) = 7 - 9
=>4x + 9y - 4x +9y = -2
=>18y = -2
=>y = -2/18 = -1/9
_____________________________
Thus, correct answer is
add to solve for x and subtract to solve for y
Answer: The answer is add to solve for x and subtract to solve for y, I hoped this helps, brainliest please? :)
Step-by-step explanation:
Related Questions
If the order of the numbers in a sum matters, then in how many ways can you represent the number 9 as the sum of three positive integers?
I already tried: 18, 32, and 30. None of them were right :(
Answers
Answer:
3
Step-by-step explanation: 9
can be expressed in three such ways, 2+3+4
, 4+5
or simply 9
hope that helps!!
A thunderstorm cloud holds about 6,200,000,000 raindrops. Which of the following shows this number in scientific notation? Answers- F- 0.62*10 to the 10th power G- 6.2*10 to the 9th power H- 6.2*10 to the 8th power J-62.0*10 to the 8th power
Answers
Answer:
the answer is G
which is 6.2*10 to the 9th power.
Step-by-step explanation:
In scientific notation you must leave one digit to the place value of ones
so that one digit is 6
So ue come up with 6.2 when ue eliminate all other zeros and end the decimal point between 6 and 2 and that way you have 6.2*10 to the 9th power
Answer:
G, 6.2*10 to the 9th power.
Step-by-step explanation:
the ratio of the number of oranges to apples to bananas is 8:5:2. if there are 120 fruits in total, how many bananas are there
Answers
Answer:
Step-by-step explanation:
To find the number of bananas, we need to determine the proportion of bananas in the total number of fruits based on the given ratio.
Let's assume that the ratio of oranges, apples, and bananas can be represented by 8x, 5x, and 2x, respectively, where x is a common multiplier.
The sum of the parts in the ratio is 8x + 5x + 2x = 15x.
We know that the total number of fruits is 120. Therefore, we can set up the following equation:
15x = 120
To solve for x, we divide both sides of the equation by 15:
x = 120 / 15
x = 8
Now that we know the value of x, we can find the number of bananas by multiplying it by the corresponding part of the ratio:
Number of bananas = 2x = 2 * 8 = 16
So, there are 16 bananas in total.
We can add all the parts to the ratio and get 15. Out of 15 parts, 2 are bananas. Now we can calculate how many fruits are in one part. One fifteenth of 120 is 8, so there are 8 fruits in one part. 2 parts are bananas, so multiplying 8 with 2 gives us our answer, 16.
a. giving brainliest to first -correct- answer. please answer fast!!
Answers
Answer:
Taiwan is the correct answer
Step-by-step explanation:
Whats the answer? I'll give brainleist!
Answers
Answer:
51 \(\frac{1}{5}\) laps
Step-by-step explanation:
Answer:
Step-by-step explanation:
A bag contained 18 red marbles, 14 green marbles, and 20 blue marbles. A marble was randomly pulled, the color recorded, and then put back into the bag. This table above shows the results after 25 pulls.
What was the relative frequency of selecting a red or blue marble?
Red:8
Blue8
Green9
Answers
Number of red marbles pulled = 8
Number of blue marbles pulled = 8
Total marbles pulled = 25
Relative Frequency = Total Frequency / Total number of data values
Relative Frequency of red marble = 8/25
= 32%
Relative Frequency of blue marble = 8/25
= 32%
Learn more about Relative Frequency here
Visit —
https://brainly.com/question/3857836
Hope my answer helps you✌️
Mark BRAINLIEST
Yasin has tried to work the size of the angle marked g in the regular decagon below, using the fact that exterior angles sum to 360°. His workings are shown below.
a) Write a sentence to explain what Yasin has done wrong.
b) What is the size of angle g? Show all your workings.
Answers
well, Yasin is correct, the exterior angles are all 36° each, however "g" is including more than just that, Check the picture below.
Answer: 36 is wrong
Step-by-step explanation: 360 - 36 = 324 degrees
plz help me on this i dont know how to do this!!!
Answers
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Answer:
x = -4
Step-by-step explanation:
When r+s=13 and 2t+s=13 , what is the value of t?
Answers
Answer:
t = 5
Step-by-step explanation:
by using guess and check, we can plug in the numbers 5 into t, 3 into s, and 10 into r.
if t = 5, then r must mean twice that number meaning it is 10.
the remainder would be s which means it is 3.
r+s=13 into 10 + 3 = 13
2t+s=13 into 2(5) + 3 = 13
what is the value of t
t = 5
Tom and Katherine live in different towns which are linked by a bike trail. They agree to meet for a bike ride, and both set off from home at the same time. Tom rides north at a speed of 14 mph and Katherine rides south at 10 mph. The bike trail between their homes is 42 miles long. How long will it be before they meet?
Answers
Answer:
We can start by using the formula:
time = distance / speed
Let t be the time (in hours) for Tom and Katherine to meet.
Tom's distance = Tom's speed x time = 14t
Katherine's distance = Katherine's speed x time = 10t
Since they are riding towards each other, the total distance they cover is the sum of their distances:
Tom's distance + Katherine's distance = 42 miles
14t + 10t = 42
Simplifying:
24t = 42
t = 42 / 24
t = 1.75 hours
Therefore, Tom and Katherine will meet after 1.75 hours of riding.
2. The point (12, 9) is included in a direct variation. What is the constant of variation?
a. 1/2
b.3/4
c. 1
d. 2
Answers
20 points to whoever gets these right!! <3
Answers
Answer:
1st one 8/20
Step-by-step explanation:
Which of these types of angles have the same measure after being rotated, reflected, or translated in a coordinate plane? Select all that apply.
Answers
9514 1404 393
Answer:
all of them
Step-by-step explanation:
Rotation, reflection, and translation are "rigid motions," so do not affect segment lengths or angles. Every angle type has the same measure after such a transformation.
Robin wants to buy a membership at a carwash this summer so that she can keep her car clean. She compared deals from Speedy Clean Carwash and Sudsy Bubbles Carwash to decide which membership to get. Robin arranged the information in the tables below.
How many times will Robin need to wash her car to spend the same amount at both carwashes?
P.S.: I attached the table below:)
Answers
Help pls I’ll give brainliest
Answers
Answer:
7*7n=49n
-6V
-9*6n= -54n
-5k*-9=45k
-8*3b= -24b
double negative 6x answer 6x
-10*2a= -20a
-4*7p= -28p
Step-by-step explanation:
Answer:
1) 7 - 56n
2) -54 - 54v
3) -9n - 54
4) -45k + 90
5) -8b - 24
6) -3x + 9
7) -10a - 20
8) -16 - 12p
please give brainliest thanks
Select the equivalent expression.
(
4
3
y
)
3
=
?
(
y
4
3
)
3
=?left parenthesis, start fraction, 4, cubed, divided by, y, end fraction, right parenthesis, cubed, equals, question mark
Choose 1 answer:
Choose 1 answer:
(Choice A)
A
4
9
y
y
4
9
start fraction, 4, start superscript, 9, end superscript, divided by, y, end fraction
(Choice B)
B
4
9
y
3
y
3
4
9
start fraction, 4, start superscript, 9, end superscript, divided by, y, cubed, end fraction
(Choice C)
C
4
6
y
4
y
4
4
6
start fraction, 4, start superscript, 6, end superscript, divided by, y, start superscript, 4, end superscript, end fraction
(Choice D)
D
4
6
y
3
y
3
4
6
start fraction, 4, start superscript, 6, end superscript, divided by, y, cubed, end fraction
Answers
Answer:
choice D
Step-by-step explanation:
QUESTION 1, 2 and, 3
please help ASAP
Answers
Answer:
b,c,d
Step-by-step explanation:
expanded form for 41.207
Answers
Answer:
40 + 1 + .2 + .007
Step-by-step explanation:
Answer:
40
+1
+0.2
+0.00
+0.007
Step-by-step explanation: Hope this helps!! Please mark me brainliest!!
A car is traveling at a steady speed. It travels 1 3/4 miles in 2 1/3 minutes. How far will it travel in 29 minutes? How far will it travel in 1 hour?
Answers
29 min = 1740 seconds
1740/140 = 12.42 by
12.42•1.75=21.74 miles
then repeat but substitute 1740 for 3600
3600/140=x
x•1.75= answer
Which equation has a constant of proportionality equal to 2?
Answers
Answer:
A) y = 10/5x
10 divided by 5 = 2
Step-by-step explanation:
I hope it helps ❤❤
I need help one this one
Answers
Which expression is equivalent to x2+7y3−8z4?
x2−7y3+8z4, 7y3−x2+8z4, 7y3+x2−8z4, or 8z4+x2−7y3
Answers
please help i need this bad
Answers
Answer:
?
Step-by-step explanation:
(answer needs to be at least 20 words long)
3) 3 (2.958)
4) 2.86 ( 2.815)
5) 2.95 ( 2.949)
6) 3.14 (3.144)
7) 2.84 ( 2.841)
1. Find the area of the parallelogram with the base B and the height H
B= 82 cm
H= 16.6 cm
A. 1,361.2 cm^2
B. 6,724cm^2
C. 137.78 cm^2
D. 98.6 cm^2
Answers
A. 11,361.2 cm^
evaluate x+3 squared by 2 - 6 when x = 4
Answers
Answer:
43
General Formulas and Concepts:
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightStep-by-step explanation:
Step 1: Define
Identify.
(x + 3)² - 6
x = 4
Step 2: Evaluate
Follow Order of Operations.
Substitute in x [Equation]: (4 + 3)² - 6(Parenthesis) Add: 7² - 6Exponents: 49 - 6Subtract: 43Answer:
43
Step-by-step explanation:
Assuming you meant "evaluate x+3 squared - 6 when x = 4, we get:
(x + 3)^2 - 6
Substituting 4 for x, we get 7^2 - 6, or 43.
Geet sells televisions. He earns a fixed amount for each television and an additional $20 if the buyer gets an extended warranty. If Geet sells 18 televisions with extended warranties, he earns $1,530. How much is the fixed amount Geet earns for each television?
Answers
Answer: $65
Step-by-step explanation: first you want to get rid of the amount in extended warranties, to do this you want to multiply 20 and 18. by doing this you get 360, so subtract 360 from 1530 and you get 1170. To find out the fixed amount per you want to divide by the amount of televisions sold which is 18. So 1170 divided by 18 is 65 so that is the fixed amount.
the bottom of a ladder must be placed 3 feet from the wall. The ladder is 10 ft long. How far above the ground does the ladder touch the wall? please draw a picture. yes, I actually need a picture I just do.
Answers
Answer:
The distance between the top of the ladder an the ground is 9.5ft
Sandra bought 4 pounds of sweet potatoes for $5.36. What is the cost per pound of
the sweet potatoes?
A. $0.75
B. $1.34
C. $1.26
D. $9.36
Answers
Answer:
B. $1.34
Step-by-step explanation:
5.36 ÷ 4
=536×1/4×1/100
=536/400
=1.34
Which of the following best describes the relationship between the variables on the scatter plot?
A: linear and non-linear association
B: non-linear association
C: linear association
D: no association
Answers
Express the following sums and summation notation.
pls help me, i need this for tomorrow
Answers
For question 6 the answer is 91 just add the numbers