Correct. The total time y equals playing time plus warm-up time. So $\displaystyle{y}={1.5}{x}+{0.5}\usepackage{cmbright}\Huge\$ hours if he plays x sets. Graph the line and find the x-coordinate when $\displaystyle{y}={8}\usepackage{cmbright}\Huge\$ . It is $\displaystyle{x}={5}\usepackage{cmbright}\Huge\$ . This tells you that if he has 8 hours, then he can play 5 sets.