Explain whether each following example is proportional or non-proportional. Please state whether it is
proportional or non-proportional AND explain how you know. You will not get full credit for correct answers
without an explanation.
 Is this equation proportional or non-proportional? How do you know? y  7x  3
 Is the graph below proportional or non-proportional? How do you know?
 Is this situation proportional or non-proportional? How do you know? A gallon of milk costs $1.99. A
half-gallon of milk costs $3.89.
 Is the data in the table below proportional or non-proportional? How do you know?
x y
2 13
3 19.5
4 26
5 32.5