Sam has a collection of yellow and red cards. Yellow cards are worth 3 points and red cards are worth 5 points. He has at most 15 cards, totaling at least 45 points. This can be modeled by the following system.

$\displaystyle{y}+{r}\le{15}\usepackage{cmbright}\Huge\$

$\displaystyle{3}{y}+{5}{r}\ge{45}\usepackage{cmbright}\Huge\$

Graph the system. Then use the graph to determine which combination is a solution.