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1) 4x + 2y = 18 (9)
2) - 9x + 8y = - 53 (4)
36x + 18y = 162
- 36x + 32y = - 212
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0x + 50y = - 50
50y = - 50
y = - 50/50
y = - 1
El valor de y lo reemplazo en ecuación 1
4x + 2y = 18
4x + 2 (- 1) = 18
4x - 2 = 18
4x = 18 + 2
4x = 20
x = 20/4
x = 5
Solución :
x = 5
y = - 1