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4x+15=9+8y
Add 8y to both sides.
4x=9+8y-15
Subtract 15 from both sides.
4x=-6+8y
Subtract 15 from 9 to get -6.
4x=8y-6
The equation is in standard form.
\frac{4x}{4}=\frac{8y-6}{4}
Divide both sides by 4.
x=\frac{8y-6}{4}
Dividing by 4 undoes the multiplication by 4.
x=2y-\frac{3}{2}
Divide -6+8y by 4.
-8y+15=9-4x
Subtract 4x from both sides.
-8y=9-4x-15
Subtract 15 from both sides.
-8y=-6-4x
Subtract 15 from 9 to get -6.
-8y=-4x-6
The equation is in standard form.
\frac{-8y}{-8}=\frac{-4x-6}{-8}
Divide both sides by -8.
y=\frac{-4x-6}{-8}
Dividing by -8 undoes the multiplication by -8.
y=\frac{x}{2}+\frac{3}{4}
Divide -6-4x by -8.