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1) 5x + 3y = 5 (-4)
2) 4x + 7y = 27 (5)
- 20x - 12y = - 20
20x + 35y = 135
-----------------------
0x + 23y = 115
23y = 115
y = 115/23
y = 5
Reemplazo el valor de y en ecuación 1.
5x + 3y = 5
5x + 3 (5) = 5
5x + 15 = 5
5x = 5 - 15
5x = - 10
x = -10/5
x = - 2
Solución :
x = - 2
y = 5