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1) 2x + 9y = 32 (4)
2) 4x + 3y = 4 (-2)
8x + 36y = 128
- 8x - 6y = - 8
-----------------------
0x + 30y = 120
30y = 120
y = 120/30
y = 4
El valor de y lo reemplazo en ecuación 2
4x + 3y = 4
4x + 3 (4) = 4
4x + 12 = 4
4x = 4 - 12
4x = - 8
x = - 8/4
x = - 2
Solución :
x = - 2
y = 4