Solve for x
x=\frac{69-y}{2}
Solve for y
y=69-2x
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4x+2y=138
Swap sides so that all variable terms are on the left hand side.
4x=138-2y
Subtract 2y from both sides.
\frac{4x}{4}=\frac{138-2y}{4}
Divide both sides by 4.
x=\frac{138-2y}{4}
Dividing by 4 undoes the multiplication by 4.
x=\frac{69-y}{2}
Divide 138-2y by 4.
4x+2y=138
Swap sides so that all variable terms are on the left hand side.
2y=138-4x
Subtract 4x from both sides.
\frac{2y}{2}=\frac{138-4x}{2}
Divide both sides by 2.
y=\frac{138-4x}{2}
Dividing by 2 undoes the multiplication by 2.
y=69-2x
Divide 138-4x by 2.
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