1. Is the relation shown to the right a function? Use the graph to justify your response. (0, 0), (2, 0), (2, 2), and (3, 4)
a. Yes; Each x-value has a unique y-value.
b. Yes; Each y-value has a unique x-value.
c. No; Two points have different y-values for the same x-value of 2.
d. No; Two points have different x-values for the same y-value of 2.