Solve for x
x=396-3y
Solve for y
y=-\frac{x}{3}+132
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4+x=400-3y
Subtract 3y from both sides.
x=400-3y-4
Subtract 4 from both sides.
x=396-3y
Subtract 4 from 400 to get 396.
3y+x=400-4
Subtract 4 from both sides.
3y+x=396
Subtract 4 from 400 to get 396.
3y=396-x
Subtract x from both sides.
\frac{3y}{3}=\frac{396-x}{3}
Divide both sides by 3.
y=\frac{396-x}{3}
Dividing by 3 undoes the multiplication by 3.
y=-\frac{x}{3}+132
Divide 396-x by 3.
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