Solve for x
x=10y
Solve for y
y=\frac{x}{10}
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9x=90y
Combine 8x and 1x to get 9x.
\frac{9x}{9}=\frac{90y}{9}
Divide both sides by 9.
x=\frac{90y}{9}
Dividing by 9 undoes the multiplication by 9.
x=10y
Divide 90y by 9.
9x=90y
Combine 8x and 1x to get 9x.
90y=9x
Swap sides so that all variable terms are on the left hand side.
\frac{90y}{90}=\frac{9x}{90}
Divide both sides by 90.
y=\frac{9x}{90}
Dividing by 90 undoes the multiplication by 90.
y=\frac{x}{10}
Divide 9x by 90.
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