Question

X+y=1
2x+4y= -2
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Answer 1

1)

X+y=1

Y=1-x

2)

2x+4y= -2

4y=-2-2x

Y=-2-2x/4

1-x/1=-2-2x/4

1(-2-2x)=4(1-x)

-2-2x=4-4x

-2x+4x=4+2

2x=6

X=6/2

X=3

Y=1-x

Y=1-3

Y=-2

X=3

Y=-2