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.

Total cost = 1.50 per bottle

y = 1.50x

If x = 1, y = $ 1.50 (1,1.5)

If x = 2, y = $ 3.00 (2,3)

If x = 3, y = $ 4.50 (3, 4.5)

If x = 4, y = $ 6.00 (4, 6)

There are your 4 sets of ordered pairs to graph.

You could continue with more x-values to get more ordered pairs.