Solve for x
x=\frac{y-40}{10}
Solve for y
y=10\left(x+4\right)
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40+10x=y
Swap sides so that all variable terms are on the left hand side.
10x=y-40
Subtract 40 from both sides.
\frac{10x}{10}=\frac{y-40}{10}
Divide both sides by 10.
x=\frac{y-40}{10}
Dividing by 10 undoes the multiplication by 10.
x=\frac{y}{10}-4
Divide y-40 by 10.
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