\{ \frac { x } { 10 } + \frac { y } { 20 } = 15
Solve for x
x=-\frac{y}{2}+150
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2x+y=300
Multiply both sides of the equation by 20, the least common multiple of 10,20.
2x=300-y
Subtract y from both sides.
\frac{2x}{2}=\frac{300-y}{2}
Divide both sides by 2.
x=\frac{300-y}{2}
Dividing by 2 undoes the multiplication by 2.
x=-\frac{y}{2}+150
Divide 300-y by 2.
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