Solve for x
x=3y+4
Solve for y
y=\frac{x-4}{3}
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-5x=-20-15y
Subtract 15y from both sides.
-5x=-15y-20
The equation is in standard form.
\frac{-5x}{-5}=\frac{-15y-20}{-5}
Divide both sides by -5.
x=\frac{-15y-20}{-5}
Dividing by -5 undoes the multiplication by -5.
x=3y+4
Divide -20-15y by -5.
15y=-20+5x
Add 5x to both sides.
15y=5x-20
The equation is in standard form.
\frac{15y}{15}=\frac{5x-20}{15}
Divide both sides by 15.
y=\frac{5x-20}{15}
Dividing by 15 undoes the multiplication by 15.
y=\frac{x-4}{3}
Divide -20+5x by 15.
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