\{ 2 ( x - 10 ) = ( y + 10 )
Solve for x
x=\frac{y+30}{2}
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2x-20=y+10
Use the distributive property to multiply 2 by x-10.
2x=y+10+20
Add 20 to both sides.
2x=y+30
Add 10 and 20 to get 30.
\frac{2x}{2}=\frac{y+30}{2}
Divide both sides by 2.
x=\frac{y+30}{2}
Dividing by 2 undoes the multiplication by 2.
x=\frac{y}{2}+15
Divide y+30 by 2.
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