Question

Let X = {1,2,3,4}, where R is a relation on X. Determine whether the relation is a function: R = {(3, 1), (1, 3), (4, 4), (3, 2)}

Answer 1

A relation is a function if it passes the vertical line test. Meaning once you graph the points, and run a vertical line from to right that line should touch only one point at all times.

Answer 2

left to right**