The perimeter of the polygon is_units.

3 units

Step-by-step 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

the graph in the attached figure

step-by-step explanation:

we have

using a graphing tool

the graph in the attached figure

the roots are ( x-intercepts) x=-0.5,x=1,x=3

the y-intercept is the point (0,3)