Solve for x
x=10-y
Solve for y
y=10-x
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2x=20-2y
Subtract 2y from both sides.
\frac{2x}{2}=\frac{20-2y}{2}
Divide both sides by 2.
x=\frac{20-2y}{2}
Dividing by 2 undoes the multiplication by 2.
x=10-y
Divide 20-2y by 2.
2y=20-2x
Subtract 2x from both sides.
\frac{2y}{2}=\frac{20-2x}{2}
Divide both sides by 2.
y=\frac{20-2x}{2}
Dividing by 2 undoes the multiplication by 2.
y=10-x
Divide 20-2x by 2.
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