Solve for x
x=4y+15
Solve for y
y=\frac{x-15}{4}
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x-15=4y
Add 4y to both sides. Anything plus zero gives itself.
x=4y+15
Add 15 to both sides.
-4y-15=-x
Subtract x from both sides. Anything subtracted from zero gives its negation.
-4y=-x+15
Add 15 to both sides.
-4y=15-x
The equation is in standard form.
\frac{-4y}{-4}=\frac{15-x}{-4}
Divide both sides by -4.
y=\frac{15-x}{-4}
Dividing by -4 undoes the multiplication by -4.
y=\frac{x-15}{4}
Divide -x+15 by -4.
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