Posted by **Lily** on Wednesday, June 11, 2008 at 8:48pm.

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

They give me 2 lengths:

2x+3 and 3x+1 how could I find the missing length x?

would I add 2x+3+3x+1? and then subtract the total by 9x+11?

- Pre Algebra -
**Reiny**, Wednesday, June 11, 2008 at 9:41pm
Is your figure a triangle?

Are the three sides 2x+3, 3x+1, and x ??

If so, then

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

6x - 9x = 11 - 4

x = -7/3 ..... makes no sense

OK, try something different.

let the third side be y

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

y = 9x-5x+11-4

y = 4x+7

- Pre Algebra -
**Lily**, Wednesday, June 11, 2008 at 9:59pm
ohh, ok, thank you so much :)

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