Question

The perimeter of the polygon is_______units.

Answer 1

3 units

Explanation:

Since the sides are congruent, then

5 - 2x = - 4x + 9 ( add 4x to both sides )

5 + 2x = 9 ( subtract 5 from both sides )

2x = 4 ( divide both sides by 2 )

x = 2

Then

5 - 2x = 5 - 2(2) = 5 - 4 = 1

perimeter = 3 × 1 = 3 units