Answer
(a) Each $x$ or first coordinate is paired with a unique $y$ or second coordinate and all the $y$ values or second coordinates are distinct therefore the function is one-to-one.
(b) The inverse is $\{(2,1), (5,3), (8,5), (10,6)\}.$
Work Step by Step
(a) Since for each $x$ or first coordinate there is a unique $y$ or second coordinate, and all the second coordinates are distinct, then the given function is one-to-one.
(b) The inverse of the given function can be found by interchanging the $x$ and $y$ coordinates (or first and second coordinates) of each point (ordered pair).
Hence, the inverse is $\{(2,1), (5,3), (8,5), (10,6)\}.$
