Question

In a direct variation, y is 4 when x is twelve. What is y when x equals six?

negative two

2

3

eighteen

Answer 1

Formula for direct variation is:
\[y = kx\]
You are given this:
y = 4 when x = 12
so we need to find what the variable k is (k is a constant).
\[k = \frac{ y }{ x } = \frac{ 4 }{ 12 } = \frac{ 1 }{ 3 }\]
so you need to find what y is when x = 6, just plug in your values of k and x into
\[y = kx \]
to find the value of y.

Answer 2

how do i know what is

Answer 3

what k is

Answer 4

I just explained it.

Answer 5

is it 18

Answer 6

I....
Idekrn

Answer 7

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