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10y - 10x = 11y - 12x ---> 2x - y = 0 ---> 2x = y ..... (2)
Reemplazando (2) en (1):
18x - 4(2x) = -10
18x - 8x = -10
10x = -10
x = 10/-10
x = -1
Ahora, reemplazamos x = -1 en (2):
2(-1) = y
-2 = y
y = -2
Rpta:
x = -1
y = -2
10y-11y=-12x+10x
-y=-2x
y=2x
2x+10=4(2x-4x)
2x+10=4(2x)
2x+10=8x
2x-8x=-10
-6x=-10
x=-10/-6
x=5/3
revisale bien