Which line is perpendicular to a line that has a slope of 1/2?

line HJ, because line with slope 1/2 is AB=2/4=1/2.

AB is perpendicular to HJ, because it forms right angle

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

1010: 3030

is it i think