Solve for x
x=\frac{y-23}{3}
Solve for y
y=3x+23
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y-2=3x+21
Use the distributive property to multiply 3 by x+7.
3x+21=y-2
Swap sides so that all variable terms are on the left hand side.
3x=y-2-21
Subtract 21 from both sides.
3x=y-23
Subtract 21 from -2 to get -23.
\frac{3x}{3}=\frac{y-23}{3}
Divide both sides by 3.
x=\frac{y-23}{3}
Dividing by 3 undoes the multiplication by 3.
y-2=3x+21
Use the distributive property to multiply 3 by x+7.
y=3x+21+2
Add 2 to both sides.
y=3x+23
Add 21 and 2 to get 23.
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