What is Direct Variation?

Question

I got a math test tomorrow on linear and nonlinear equations. I have no idea what partial and direct variations are and all the videos and examples I've seen don't make any sense. HELP!

Answer 1

direct variation means that when x increases, for example, then, so does y.

This looks like:

x/y = k, where k is a constant.

For example, if k = 20, then, x/y could be 40/2. If x increases to 80, then y will increase to 4. The same is true for decreasing.

What is a partial variation?

A relationship between two variables in which one variable is a constant multiple of the other plus a constant value. Graph DOES NOT pass through the origin. Represented by y=mx+b form