It is possible to find slope from a table and slope from the graph. If you were given two ordered pairs how do you suppose you could find the slope between the two ordered pairs?

The scatter plot shows the number of animal cells clara examined in a laboratory in different months: plot ordered pairs 1, 20 and 2, 60 and 3,100 and 4, 140 and 5, 180 what is the approximate predicted number of animal cells clara examined in the 9th month?