Description: Learn to determine if a table of values represents a linear function. Created by Sal Khan. So let's see what happened to what our change in x was. Now, in order for this to be a linear equation, the ratio between our change in y and our change in x has to be constant. So our change in y over change in x for any two points in this equation or any two points in the table has to be the same constant.*Teacher Advisor is 100% free.