when you're given an ordered pair and a system of equations, always try plugging the point in and seeing if the result is true or false.
3x + 4y = 18
2x - 2y = 2
3(2) + 4(3) = 18
6 + 12 = 18
18 = 18 is true.
2(2) - 2(3) = 2
4 - 6 = 2
-2 = 2 is false.
this point is not a solution for this system of equations. it works for the first equation, but not for the second.
