Posted by **chelsea** on Friday, June 10, 2011 at 8:08am.

Which of the following represents a direct variation function?

The answer coices are

A)d=2r

B)y=9x+1

C)y=-3

D)a=1/2h(b1+b2)

- MATH-direct variation -
**MathMate**, Sunday, June 12, 2011 at 8:25am
A direct variation should

1. be a *linear* function of *one* variable

2. passes through the origin (0,0), i.e. if the independent variable is set to zero, the dependent variable should also be zero.

If you examine the four choices according to the above criteria, you will be able to eliminate all but the required function.

- MATH-direct variation -
**zymetriea**, Tuesday, November 27, 2012 at 6:07pm
-4 + 7x + 4 = 3y

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