x+y=12
x-y=4
resolver por metodo de igualacion
x + y = 12
x - y =4
x + y + x - y = 12 +4
2x = 16
x = 8
x + y - x + y = 12 -4
2y = 8
y = 4
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x + y = 12
x - y =4
x + y + x - y = 12 +4
2x = 16
x = 8
x + y - x + y = 12 -4
2y = 8
y = 4