Question

HELP!! I WILL GIVE A MEDAL!!!

Answer 1

Start with a standard linear equation, as we can clearly see they have a linear relationship.
A = xB+y
Now input 2 points on the shown line to get values of x and y.

Hope this helps.

Answer 2

But what is A and B?

Answer 3

A and B are the variables representing 2 quantities. Each point on the shown line represents (A,B) coordinates.