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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
Reemplazo el valor de y en ecuación 1.
x + y = 4
x + 1 = 4
x = 4 - 1
x = 3
Solución :
x = 3
y = 1