## Intermediate Algebra (6th Edition)

$y=7-\frac{7x}{3}$
We are given that $7x+3y=21$. To solve for y, first subtract 7x from both sides. $3y=21-7x$ Divide both sides by 3. $y=\frac{21-7x}{3}=7-\frac{7x}{3}$