PLEASE HELP FOR 48 POINTS PLEASE!
show/explain your answer and work
2 answers:
Answer:
C
Step-by-step explanation:
The equation you are looking for must look something like y = k*x
The easiest way to find it is to try 2 points to see if k would be equal in both cases. Do this for each choice.
A
- y = kx
- x = 5
- y = 1
- y = kx
- 1 = k*5
- k = 1/5
- y = kx
- x = 7
- y = 2
- 2 = k*7
- k = 2/7
k is not the same in both case. A is not the answer.
==================
B
Using the steps above
- x = 10
- y = -6
- k = -6/10 = - 0.6
- x = 6
- y = -3
- k = - 3/6
- k = -1/2
B is not the answer.
=====================
C
- x = 3
- y = 9
- y = kx
- 9 = k*3
- k = 9/3
- k = 3
- x = 6
- y = 18
- y = kx
- 18 = 6k
- 18/6 = 6/6 k
- k = 3
C is the answer
====================
You can try D yourself
Answer:
c This is the direct variation
Step-by-step explanation:
The equation for direct variation is y= kx
Solving this for k
y/x =k
So y/x must be a constant
a. 9/3 =3
2/7 does not =3 so this is not a direct variation
b 1/2 = .5
-3/6 = -.5
This is not the same so this is not a direct variation
c. 27/9 =3
18/6 =3
9/3 =3
This is a direct variation with a constant of 3
d 5/-7 = -5/7
1/-3 = -1/3
This is not the same so this is not a direct variation
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Nice job on getting the correct answer.
