Solve for x
x=\frac{y}{39}
Solve for y
y=39x
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x+y-40x=0
Subtract 40x from both sides.
-39x+y=0
Combine x and -40x to get -39x.
-39x=-y
Subtract y from both sides. Anything subtracted from zero gives its negation.
\frac{-39x}{-39}=-\frac{y}{-39}
Divide both sides by -39.
x=-\frac{y}{-39}
Dividing by -39 undoes the multiplication by -39.
x=\frac{y}{39}
Divide -y by -39.
y=40x-x
Subtract x from both sides.
y=39x
Combine 40x and -x to get 39x.
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