Explicación paso a paso:
x=4-2y
x=4-2•(-1)
x=4+2
x=6
3•(4-2y)-y=5
12-6y-y=5
-6y-y=5-12
-7y=7
y=-7/7
y=-1
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Explicación paso a paso:
x=4-2y
x=4-2•(-1)
x=4+2
x=6
3•(4-2y)-y=5
12-6y-y=5
-6y-y=5-12
-7y=7
y=-7/7
y=-1