Start with looking at the y-axis, and count down the line until you get to a definite point. So we can see there is a definite point at (0,4) and (3,2). To get from (0,4) to (3,2), we have to go down 2 (-y) and to the right by 3 (positive x).
Rational number: Whole number isn't likely, negative integer isn't change, rational number is most likely, irrational number is not possible for cash change.
