Find the slope of the line that passes through the points.
(1,9) and (4,5)

We can use the slope formula

y2-y1/x2-x1

Now we can use this with any 2 known points to determine slope

9-5=4

4-1=3

4/3 slope

M = 1.333333

Step-by-step explanation:

Slope = y2 - y1 / x2 - x1

5 - 9 / 4 - 1

-4 / 3

M = -1 1/3

expression #3 is not equivalent. the others are.

1) c 2143.6 cm

2) c 113.0 m

3) a 33.5 ft

4)   d 2 cm

5) c 20 mm

6) 180 in

7) d 120 ft