Explicación paso a paso:
x+y=2
2x+y=3
x=2-y
2(2-y)+y=3
4-2y+3y=3
y=1
x+1=2
x=1
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Explicación paso a paso:
x+y=2
2x+y=3
x=2-y
2(2-y)+y=3
4-2y+3y=3
y=1
x+1=2
x=1