3x - 2y = 11
x+ 5y = -2
by rref matrices

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

180-142=38 for the acute angle next to the entry

90+38=128

180-128=52

a=52

step-by-step explanation: