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1) x + y = 4 (-2)
2) 2x + 4y = 10 (1)
- 2x - 2y = - 8
2x + 4y = 10
---------------------
0x + 2y = 2
2y = 2
y = 2/2
y = 1
El valor de y sustituyo en ecuación 1
x + y = 4
x + 1 = 4
x = 4 - 1
x = 3
Solución :
x = 3
y = 1