Question

Which of the following equations represents a direct variation?

y equals 8

y equals 8 divided by x

y equals 8 times x

y equals x plus 8

Answer 1

Ok so a direct variation means that as you scale one side, the other side will scale linearly.

Answer 2

As one increases, the other increases linearly. That is direct variation.

As one increases, the other decreases linearly. This is called "indirect" variation.

Answer 3

There is no variation with y = 8. This is just saying that y doesn't vary at all.

So it cannot be A

Answer 4

y = 8/x Hmm, it seems that when one increases, the other decreases linearly. This is indirect variation. So it cannot be B.

Answer 5

Let's see what you get for C and D =0D

Answer 6

I'm guessing its C...