Answer
$\{(3,-4)\}$.
Work Step by Step
Use elimination, multiply 2 to the first equation to get $4x-6x=36$, multiply 3 to the second equation to get $15x+6x=21$. Add up the two equations to get $19x=57$, thus $x=3$ and the first equation becomes $2(3)-3y=18$ which gives $y=-4$. The solution set is $\{(3,-4)\}$.
