### Proportionality

When data is PROPORTIONAL it:

-Has to start at the Origin (0,0). Y-Intercept is 0.

-Has a constant rate of change (m=y/x)

-Is Linear

-Has an equation in the form of y=mx

When data is NON-PROPORTIONAL it is missing one of the following:

-Does not start at the Origin (0,0). Y-Intercept is not 0.

-Does not have a constant rate of change (m=y/x)

-Linear

-Equation is in the form of y=mx+b