Solve for x
x=\frac{7\left(y+3\right)}{4}
Solve for y
y=\frac{4x}{7}-3
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4x=21+7y
Add 7y to both sides.
4x=7y+21
The equation is in standard form.
\frac{4x}{4}=\frac{7y+21}{4}
Divide both sides by 4.
x=\frac{7y+21}{4}
Dividing by 4 undoes the multiplication by 4.
-7y=21-4x
Subtract 4x from both sides.
\frac{-7y}{-7}=\frac{21-4x}{-7}
Divide both sides by -7.
y=\frac{21-4x}{-7}
Dividing by -7 undoes the multiplication by -7.
y=\frac{4x}{7}-3
Divide 21-4x by -7.
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