What is the slope of that line

Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it.how many multiple-choice questions are on the test?

You decide instead to take the train there. the train will take 135 minutes. convert this into hours and minutes.

For the equations below which statement is true ?