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4X - 3Y = 18 (2)
2Y + 7 = X Reemplazo en (2)
4(2Y + 7) - 3Y = 18
8Y + 28 - 3Y = 18
5Y + 28 = 18
5Y = 18 - 28
5Y = -10
Y = -10/5
Y = -2
Ahora hallo el valor de X
2Y + 7 = X
2(-2) + 7 = X
-4 + 7 = X
X = 3
Rta: X = 3; Y = -2