Answer:
(x, y) = (17, 15)
Step-by-step explanation:
Adding the two equations gives ...
(3x -6y) +(-3x +4y) = (-39) +(9)
-2y = -30
y = 15
__
Substituting this value of y into the second equation, we get ...
-3x +4(15) = 9
-3x = -51
x = 17
The solution is (x, y) = (17, 15).
