Question

Judith has her own business repairing computers. The set of ordered pairs below represents various hours worked and her charge. For example, (1, 25) means 1 hour worked and a $25 charge.
{(1, 25), (2, 50), (4, 100), (6, 150)}
a. Explain what the ordered pair (4, 100) represents.
b. Is the set of ordered pairs a function? Explain.
c. What would the value of y be in the ordered pair (9, y)? Explain.