The length of each of the congruent sides of an isosceles triangle is 3x-1. The length of the third side is 2x-1. The perimeter is 55 feet. Which equation does NOT represent the perimeter

Answer 1

The perimeter is the sum of all 3 sides = 2(3x-1)+2x-1 = 6x-2 +2x-1 = 8x-3

8x-3=55

8x=55+3=58

x=58/8= 29/4

the short side of the triangle is 2x-1 = 2(29/4)-1 = 29/2 - 1 = 27/2 = 13 1/2

the other two sides = 3x-1 = 3(29/4)-1 = 87/4-1 = 83/4 = 20 3/4 each

twice 20 3/4 = 83/2 plus 27/2 = 110/2 = 55 = the perimeter

Main equation for the perimeter is 8x-3=55 = sum of the 3 sides=perimeter

double two longer sides plus shorter side = perimeter

or 2(20 3/4) + 13 1/2 = 55

or 83/2 + 26/2 = 55

or 166/4+54/4 = 55