Makayla and her children went into a grocery store where they sell apples for
$0.75 each and peaches for $1.50 each. Makayla has $15 to spend and must
buy no less than 12 apples and peaches altogether. If a represents the number
of apples purchased and y represents the number of peaches purchased, write
and solve a system of inequalities graphically and determine one possible
solution.