Answer
(a) Each second coordinate is paired with only one first coordinate.
Thus, the given function is one-to-one.
(b) The inverse can be found by interchanging the first and second coordinates.
Thus, the inverse of the given function is:
$$\left\{(2, 1) (5, 3), (8, 5), (10, 6)\right\}$$
Work Step by Step
Recall:
A one-to-one function is a function where second coordinate is paired to only one first element.
(a) Note that each second coordinate is paired with only one first coordinate.
Thus, the given function is one-to-one.
(b) The inverse can be found by interchanging the first and second coordinates.
Thus, the inverse of the given function is:
$$\left\{(2, 1) (5, 3), (8, 5), (10, 6)\right\}$$