Which of the following situations is best represented by the equation y = 15x ?
A.) Mr. Salazar curved the test by 15 points.
B.) There were 15 more questions on the test than the last test.
C.) Mr. Salazar took off 15 points for not showing your work on the test.
D.) On the test, each question correct was worth 15 points.
(Worth 50 points!)