Answer:
x = , y = 2
Explanation:
3x + 3y - 7 = 12x + y
6y - 12x - 1 = -45x
(3x - 12x) + (3y - y) = 7
(-12x + 45x) + 6y = 1
-3(-9x + 2y = 7)
33x + 6y = 1
27x - 6y = -21
60x = -20 -> x = -20/60 = -1/3
-9x + 2y = 7 -> y = = = 2
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, y = 2 = = 2