Kerille is reading a book at the rate of 4.5 pages per minute. What ordered pair on a graph of his reading rate would represent the number of minutes it will take him to read 90 pages?

This is a linear equation y = mx, where:

m = slope or reading rate:

x = the number of minutes

y = the number of pages read.

So the equation becomes: y = 4.5. x

How many minutes it will take to read 90 pages (y):

90 = 4.5. x or x = 90/4.5 and x = 20 minutes

So the ordered pair will be (20,90)