What is math

I think you might mean "direct variation" or "directly propotionate"

Here's a simple example :

y = x

Notice that, as x gets larger, y gets larger. And, as x gets smaller, y gets smaller. And that's the whole idea. As one side of an equation changes in some direction, the other side changes in the same direction, too.

Pretty simple, huh ????

It has numbers...you can be sure of that!