1. Who is Correct?
You will be shown a problem that can be solved using the skills you learned in this module.
You will see two students’ work for the problem.
You will decide who is correct, and explain how you know.

2. 1. Who is correct? Dylan says the rate of change is 4.5.
What is the rate of change shown in the table below?
Dylan says the rate of change is 4.5.
Rachel says the rate of change is 13.5.
Who is correct, and why? x y 3
13.5 6 27 8 36 11
49.5

3. 2. Who is correct? Who is correct, and why?
Carol has $220. She needs a total of $1550 to go on a 10-day Caribbean cruise. She earns $45 per day working at a local golf course, of which she saves $30. Write an equation that Carol can use to determine the number of days, d, she needs to work to reach her goal of $1550.
Cameron says the equation would be
d = 1550.
Donte says the equation would be
d = 1550.
Keith says the equation would be
220d + 30 = 1550.
Who is correct, and why?

4. 3. Who is correct?
Identify the slope of the line that is perpendicular to the graph of 3x – 6y = 12.

5. 4. Who is correct? Who is correct, and why?
Interpret the meaning of the slope of the graph below.
Bridget says that it means that for every 3 minutes that Miguel spends on homework, Amanda spends 4 minutes.
Dana says that it means that for every 3 minutes that Amanda spends on homework, Miguel spends 4 minutes.
Who is correct, and why?