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1) 3x + 5y = 7 (1)
2) 2x - y = 4 (5)
3x + 5y = 7
10x - 5y = 20
--------------------
13x + 0y = 27
13x = 27
x = 27/13
El valor de x lo reemplazo en ecuación 2
2x - y = 4
2 (27/13) - y = 4
54/13 - y = 4
- y = 4 - 54/13
- y = (4 * 13 - 54)/13
- y = (52 - 54)/13
- y = - 2/13
y = 2/13
Solución :
x = 27/13
y = 2/13