Solve for x
x=7-20y
Solve for y
y=\frac{7-x}{20}
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x+20y=7
Multiply 4 and 5 to get 20.
x=7-20y
Subtract 20y from both sides.
x+20y=7
Multiply 4 and 5 to get 20.
20y=7-x
Subtract x from both sides.
\frac{20y}{20}=\frac{7-x}{20}
Divide both sides by 20.
y=\frac{7-x}{20}
Dividing by 20 undoes the multiplication by 20.
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