Linear Relationships Quick Check

Which of these statements about the graph is true?

• The graph is proportional and has an equation of y = -x + 18.

• The graph is non-proportional and has an equation of y = -x + 18.

• The graph is non-proportional and has an equation of y = -2x + 18.

• None of the statements are true.

Find the slope and the y-intercept of the linear function.

Zane owes his dad money for his cell phone that he lost. So far, Zane has paid his dad $23, and he will pay $45 each month until he has repaid the phone. Which equation shows the relationship between x, the number of months that Zane has been making payments and y, the total amount he has paid his dad?

• y = 45x + 23

• x = 45y + 23

• y = 23x + 45

• x = 23y + 45