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6(30-y) + 2y = 100
y = 20
x = 10
2x+2y=60 ecuación 1. cambiaremos el signo en ecuación 2 para
6x+2y=100 ecuación 2 restarlas. 2x+2y=60 2x+2y=60
- 6x -2y= -100 2(10)+2y=60
-------------------- 20 + 2y= 60
-4x = -40 2y=60-20
sale!!!!! x= -40/4 y=40/2
x= 10 y= 20