Question 60114
All three sides of the triangle have equal length. One side is 9x - 4  and another is 2(3x + 4). What is the perimeter?
First find x.  If all sides are equal then:
9x-4=2(3x+4)
9x-4=6x+8
9x-6x-4=6x-6x+8
3x-4=0+8
3x-4=8
3x-4+4=8+4
3x=12
3x/3=12/3
x=4
That's what x is, substitute 4 in for x in either side.
The sides are each:
9(4)-4=36-4=32
For fun, try this with the other side and you should get 32 also.
You find the perimeter by adding all the sides together, there are three sides to a triangle:
{{{highlight(32+32+32=96)}}}
Happy Calculating!!!