Solve for x
x=12600-3y
Solve for y
y=-\frac{x}{3}+4200
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3y+x=12600
Combine 2y and y to get 3y.
x=12600-3y
Subtract 3y from both sides.
3y+x=12600
Combine 2y and y to get 3y.
3y=12600-x
Subtract x from both sides.
\frac{3y}{3}=\frac{12600-x}{3}
Divide both sides by 3.
y=\frac{12600-x}{3}
Dividing by 3 undoes the multiplication by 3.
y=-\frac{x}{3}+4200
Divide 12600-x by 3.
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