Last Saturday two of the houses were having a party each family invited 9 guests to their house how many guests were in total

18

Step-by-step explanation:

because there where two houses each invited 9 guests and 9 + 9 = 18

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

x = 12

y = 1

for the points!