derrick worked for 3 hours and earned a total of $28.50. Which equation can be used to find r the ammount of money derrick earns per hour?

r = 9.50x

Step-by-step explanation:

First, we need to find how much money Derrick earns per hour. To do that, we divide how much money he earned by the three hours that he worked:

So every hour, Derrick makes $9.50. Now that we know the hourly rate, we can make an equation that will always tell us how much money he makes (r), given the hours (x):

CHECK:

Let's check our answer. Since we have the equation, let's see if in 3 hours, Derrick actually earned $28.50:

The equation works! By substituting the number of hours, we got the right answer.