Incorrect. The total time y equals running time plus warm-up time. So $\displaystyle{y}={0.25}{x}+{0.5}\usepackage{cmbright}\Huge\$ hours if she runs x miles. Graph the line and find the x-coordinate when $\displaystyle{y}={3}\usepackage{cmbright}\Huge\$ . The correct answer is 10 miles.