Homework Help: Pre Algebra

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 :)

Answer this Question

Related Questions

Pre Algebra - the problem is that I have to find the length of x. Here's ...
math - The perimeter of the polygon below is 9x-1. Find the expression for the ...
Math - Perimeter of pentagon is 9x-1. Find length of missing side. Sides are 3x-...
algebra - a and b are both the lengths of the legs of a right triangle, c is the...
geometry - The perimeter of an isosceles triangle is 37 in. The lengths of the ...
math - Find the missing length of the right triangle, Side is 20 and bottom is ...
geometry - The perimeter of an isosceles triangle is 37 in. The lengths of the ...
Pre Algebra - the problem is about adding and subtracting polynomials... This is...
Pre-Calculus - Composition of Functions f o g(x)=f(g(x)) --> I know that ...
Math - I'm learning about trigonometric functions, and my worksheet ...

For Further Reading

First Name:
School Subject:
Answer: