Respuesta :

apologiabiology
to sub
solve for 1 variable
pick an eas one that isn't tangles up wht frathctions or such
x in second equiaton

2y-x=-7
-x=-7-2y
x=7+2y

sub 7+2y for x
(7+2y)-4y=11
7+2y-4y=11
7-2y=11
minus 7
-2y=4
divide -2
y=-2

sub
x=7+2y
x=7+2(-2)
x=7+-4
x=3

(x,y)
(3,-2)

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