Find the slope of the line.

The Slope of a line formula is given by

m=y2 - y1/ x2 - x1

Now Form a triangle using the straight line(It'd be best if you choose known Points on the graph)

Picking points (1, 2) and (2, 5) connect these points and you'll have a small triangle.

x1 y1 x2 y2

Substituting into the formula

m=5-2/2-1

m=3.

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm

if x = 1, then the answer is 3.5