Solve for x
x=-\frac{y}{2}+100
Solve for y
y=200-2x
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4x=400-2y
Subtract 2y from both sides.
\frac{4x}{4}=\frac{400-2y}{4}
Divide both sides by 4.
x=\frac{400-2y}{4}
Dividing by 4 undoes the multiplication by 4.
x=-\frac{y}{2}+100
Divide 400-2y by 4.
2y=400-4x
Subtract 4x from both sides.
\frac{2y}{2}=\frac{400-4x}{2}
Divide both sides by 2.
y=\frac{400-4x}{2}
Dividing by 2 undoes the multiplication by 2.
y=200-2x
Divide 400-4x by 2.
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