Question

which diagram represents the equation $3a = 9$? solve for $a$. $a = \square$

Explanation:

Step1: Identify matching diagram

The equation $3a=9$ means 3 groups of $a$ equal 9. The first diagram has 3 boxes labeled $a$ with a total of 9 above, so this is the correct diagram.

Step2: Isolate $a$ by dividing both sides

Divide each side of $3a=9$ by 3:
$\frac{3a}{3} = \frac{9}{3}$

Step3: Simplify to find $a$

Simplify the fractions:
$a = 3$

Answer:

1. The top diagram (3 boxes of $a$ with total 9) represents $3a=9$.
2. $a = 3$