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1) 7x - 5y = 10 (2)
2) 2x - 3y = - 5 (-7)
Multiplicamos las ecuaciones por los números indicados.
14x - 10y = 20
-14x + 21y = 35
---------------------
0x + 11y = 55
11y = 55
y = 55/11
y = 5
Reemplazo y = 5 en ecuación dos inicial.
2x - 3y = - 5
2x - 3 (5) = - 5
2x - 15 = - 5
2x = - 5 + 15
2x = 10
x = 10/2
x = 5
Respuestas :
y = 5
x = 5