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1) - 3x + 2y = 6 (1)
2) - x + y = 8 (3)
- 3x + 2y = 6
-3x + 3y = 24
-------------------
0x + 5y = 30
5y = 30
y = 30/5
y = 6
Reemplazo el valor de y en ecuación 2.
- x + y = 8
- x + 6 = 8
- x = 8 - 6
- x = 2
x = - 2
Solución :
x = - 2
y = 6
COMPROBAMOS :
- x + y = 8
- (- 2) + 6 = 8
2 + 6 = 8
8 = 8
La solución es correcta.