Determine the equation that represents the cost (y) of buying x bottles of water.
What does the gradient represent in this equation?
What is the total cost of buying one bottle of water a day for a year (not a leap year)?
Plot the graph of the linear equation you found in the above question.
A high-quality, re llable water bottle costs approximately $40. How many bottles of water would you have to drink in order for this option to be more cost e ective?
What other factors, apart from cost, might in ence someone’s decision whether to carry their own water bottle or to buy bottles of water?