Solve for x
x=\frac{y-30}{10}
Solve for y
y=10\left(x+3\right)
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y=10x+20+10
Combine 15x and -5x to get 10x.
y=10x+30
Add 20 and 10 to get 30.
10x+30=y
Swap sides so that all variable terms are on the left hand side.
10x=y-30
Subtract 30 from both sides.
\frac{10x}{10}=\frac{y-30}{10}
Divide both sides by 10.
x=\frac{y-30}{10}
Dividing by 10 undoes the multiplication by 10.
x=\frac{y}{10}-3
Divide y-30 by 10.
y=10x+20+10
Combine 15x and -5x to get 10x.
y=10x+30
Add 20 and 10 to get 30.
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