A coffee shop displays their prices on a chalkboard menu. The prices are proportional, but some of the information got earased.
a. What is the constant of proportionality?
b. How can you use the value of k to find the missing prices on the menu?
c. How does the total cost change as the cups of coffee increase by 1?
a. The constant of proportionality, k, is the ratio between the price of the item and the number of cups of coffee.
b. To find the missing prices on the menu, divide the known price by the number of cups of coffee to calculate the value of k. Then, multiply the value of k by the number of cups of coffee for the missing item to find the price.
c. The total cost increases by the value of k for each cup of coffee added.