# Pre Algebra

posted by .

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 -

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 -

ohh, ok, thank you so much :)

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