Answer
The function is one-to-one.
Its inverse is:
$f^{-1} =\left\{(-1, -1), (1, 1), (2, 0), (0, 2)\right\} $
Work Step by Step
Every second coordinate is paired with only one first coordinate.
Thus, the function is one-to-one.
The inverse of the function is:
$f^{-1} =\left\{(-1, -1), (1, 1), (2, 0), (0, 2)\right\} $
