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Verified answer
-3x + y = 15y = 3x + 15
2x + 5y = 7
2x + 5(3x + 15) = 7
2x + 15x + 75 = 7
17x = 7 - 75
17x = -68
x = -68/17
x = -4
y = 3x + 15
= 3(-4) + 15
= -12 + 15
= 3
x + y = (-4) + 3
= -1
Jadi, nilai x + y = -1