12
11
84
12
84
Scale Factor=
x =

i think it is c, not positive though

step-by-step explanation:

from the figure we get,

the x axis shows   the months and,

the y-axis shows the number of satisfied customer.

each line or each cell in upward direction (y-axis) shows 500.

the appropriate scale for the y - axis is: -

a = 2000 customers

b = 4000 customers

c = 6000 customers

d = 8000 customers

e = 10000 customers

f = 12000 customers

g = 14000 customers

i believe it is c.y = 9x

rise over run. 9 units up over 1 unit right or 9/1