y-3x=-21 ; y=-2x+4

4y-2x=4 ; y=-4x+37

-4x=-2y-20 ; x=2y+20

x=-5y+7 ; 4x+y=28

x=y-20 ; x-2y=-30

y=-5x+40 ; 4x=74-5y

please help!!! I need these answers now cause they are due tomorrow! my teacher did one or two problems with us and nobody knows how to do them!!! thanks :D

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