Question

if the perimeter of the following triangle is 7x-2 what s the length of the unknown side
3x
3x - 4
4
3x + 4

Answer 1

ANSWER

The unknown side is 3x units.

EXPLANATION

Let the unknown side be y units.

Then the perimeter of the triangle is

$P = y + (3x - 9) + (x + 7)$

It was given that, the perimeter is 7x-2.

This implies that,

$7x - 2= y + (3x - 9) + (x + 7)$

We solve for y to get,

$7x - 2 - 3x - x + 9 - 7 = y$

Simplify to get;

$3x - 9 + 9= y$

$y = 3x$