Explicación paso a paso:
A) x-2y=4
2x+3y=1
x=4+2y
2(4+2y)+3y=1
y=-1
x=4+2×(-1)
x=2
(x,y) (2,-1)
B) x+y=4
-2x-2y=0
x=4+y
-2(4+y)-2y=0
y=-2
x=4+(-2)
(x,y) (2,-2)
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Explicación paso a paso:
A) x-2y=4
2x+3y=1
x=4+2y
2x+3y=1
2(4+2y)+3y=1
y=-1
x=4+2×(-1)
x=2
(x,y) (2,-1)
B) x+y=4
-2x-2y=0
x=4+y
-2x-2y=0
-2(4+y)-2y=0
y=-2
x=4+(-2)
x=2
(x,y) (2,-2)