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juin [17]
3 years ago
15

PLEASE HELP FOR 48 POINTS PLEASE! show/explain your answer and work

Mathematics
2 answers:
Rasek [7]3 years ago
6 0

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

pentagon [3]3 years ago
4 0

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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