Posted by **Lily** on Wednesday, June 11, 2008 at 4:47pm.

the problem is that I have to find the length of x.

Here's what they say:

Find the missing length, when the perimeter is 9x+11

then here are the length that are given on the shape: 2x+3 and 3x+1

How could I solve this?

- Pre Algebra -
**bobpursley**, Wednesday, June 11, 2008 at 4:55pm
Three sides: add them to get perimeter.

x + 2x+3 + 3x+1= 9x+11

solve for x.

- Pre Algebra -
**Lily**, Wednesday, June 11, 2008 at 5:10pm
But the problem is about adding and subtracting polynomials...

This is what I did...

2x+3+3x+1

=2x+3x+3+1

=5x+4

and

9x+11-5x+4

=9x-5x+11+4

=4x+15

but then, if I add both 5x+4+4x+15

=9x+19...

- Pre Algebra -
**Amy**, Wednesday, June 11, 2008 at 5:40pm
BobPursely gave this equation:

x + 2x+3 + 3x+1= 9x+11

If you only look at the left side, you'll get 6x + 4.

Your new equation should read:

6x + 4 = 9x + 11

Does that help?

- Pre Algebra -
**Lily**, Wednesday, June 11, 2008 at 5:54pm
im not sure?

- Pre Algebra -
**Amy**, Wednesday, June 11, 2008 at 5:56pm
Ok. From here, you need to solve for x. The easiest way to do that is to get x on one side of the equation. Do you know how to do that?

- Pre Algebra -
**Lily**, Wednesday, June 11, 2008 at 6:00pm
yes :)

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