Solve for x
x=\frac{y+400}{2}
Solve for y
y=2\left(x-200\right)
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-2x+y=-400
Subtract 400 from both sides. Anything subtracted from zero gives its negation.
-2x=-400-y
Subtract y from both sides.
-2x=-y-400
The equation is in standard form.
\frac{-2x}{-2}=\frac{-y-400}{-2}
Divide both sides by -2.
x=\frac{-y-400}{-2}
Dividing by -2 undoes the multiplication by -2.
x=\frac{y}{2}+200
Divide -400-y by -2.
-2x+y=-400
Subtract 400 from both sides. Anything subtracted from zero gives its negation.
y=-400+2x
Add 2x to both sides.
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