solve for y.\n4y + 9 = 21\ny = ?

Explanation:

Step1: Isolate the term with y

Subtract 9 from both sides. $4y+9 - 9=21 - 9$ $4y = 12$

Step2: Solve for y

Divide both sides by 4. $\frac{4y}{4}=\frac{12}{4}$ $y = 3$

Answer:

3