Question

In an equilateral triangle, all three side lengths are equal. Suppose you know that the perimeter of equilateral triangle ABC is (18x − 9) meters. Determine which of the given side lengths, if any, represent the side lengths of equilateral triangle ABC. Explain why or why not. (a) (6x − 3) meters (b) (x − 3) meters (c) 3(2x − 1) meter

Answer 1

All sides are equal legnth
3 sides so

if one side is legnth, y
the perimiter is 3y
3y=18x-9
divide both sides by 3
y=6x-3

A is answer

Answer 2

It's A because the 18x/3 = 6x, and A is the only option with 6x present