A bottle of water costs $1.50. Explain how you would make a graph of four ordered pairs to model the total cost of the water in terms of the number of bottles.

Answer 1

you already have one pair: (1,1.50)
Now just pick any positive integer, and multiply it by 1.50. That will give you other pairs:

(2,3.00)
(102,153.00)
(9231,13846.50)

For convenience of graphing, I'd stick with small numbers, though! :-)