Below is a graph of test scores in a math class. Determine if the Points earned for each Correct Answer is proportional or not proportional. Explain your answer.

The graph is proportional. It is a straight line through the origin.
The slope is the constant
slope is (120-30)/(20-5) =90/15 =6
y = 6x
Check:
y = 6*12 =72
y = 6*18 =108