A table of values of a linear function is shown below.
$x$-2 0 2 4
$y$-4 -3 -2 -1
Find the $y$-intercept and slope of the function's graph.
$y$-intercept: □
slope: □
$x$ | -2 | 0 | 2 | 4 |
$y$ | -4 | -3 | -2 | -1 |