Austin and his children went into a restaurant where they sell drinks for $1.50 each and tacos for $3 each. Austin has $30 to spend and must buy at
least 15 drinks and tacos altogether. Also, he must buy a maximum of 15
drinks. If t represents the number of drinks purchased and y represents the
number of tacos purchased, write and solve a system of inequalities
graphically and determine one possible solution,