If I am attempting to find the perimeter of a triangle in which the side lengths given are 7x centimeters and 5x + 16 centimeters what is the last side length

OwenT154 Sep 13, 2017

#5**+1 **

Ok then. I got the answer.

In an equilateral triangle, all the side lengths are the same.

So that means 7x = 5x + 16.

Subtract 5x to both sides to get 2x = 16.

Divide both sides by 2 to get **x = 8.**

But that's not our answer. We need to plug in 8 instead of x to one of the 'sides equations.'

Let's plug it into 7x.

7(8) = 56. Remeber, we substituted 8 for x.

So we know a side of the equilateral triangle is 56 cm.

And we know that all the side lengths are the same.

So the last side length would be **56 cm.**

Gh0sty15 Sep 13, 2017