Posted by **Allyson** on Monday, October 18, 2010 at 2:43pm.

So I have to solve this problem

9a=6(a+4)

And then I wrote down:

9a=6a+24

but I don't know what to do from there, can someone explain to me please?

- Algebra, explain? -
**Ms. Sue**, Monday, October 18, 2010 at 2:50pm
9a=6a+24

The next step is to combine like terms and get the knowns on one side and the unknowns on the other.

Subtract 6a from both sides of the equation.

9a - 6a = 6a - 6a + 24

3a = 24

Divide both sides by 3 to find the value of a.

3a/3 = 24/3

a = 8

- Algebra, explain? -
**Allyson**, Monday, October 18, 2010 at 2:57pm
Okay, when I checked my answer, how come I got 72? when I put 8 As A into the equation.

- Algebra, explain? -
**Ms. Sue**, Monday, October 18, 2010 at 3:03pm
That's what the original problem states: 72 = 72

9a=6(a+4)

9(8) = 6(8 + 4)

72 = 72

- Algebra, explain? -
**Allyson**, Monday, October 18, 2010 at 3:03pm
So I could have two answers... ? 8 and 72?

- Algebra, explain? -
**Ms. Sue**, Monday, October 18, 2010 at 3:07pm
No.

You only need to find what a represents. As we found, in this problem a = 8.

You proved it by substituting 8 for a in the original problem.

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