Answer
The slope of the given line $m=-3$ and its $y$-intercept is $(0,2)$
Work Step by Step
$f(x)=-3x+2$
Substitute $f(x)$ by $y$, for representative purposes:
$y=-3x+2$
This equation of this line is now in slope-intercept form. This form is $y=mx+b$, where $m$ is the slope of the line and $b$ is its $y$-intercept.
In this case, $m=-3$ and $b=2$
The slope of the given line $m=-3$ and its $y$-intercept is $(0,2)$
The graph is shown below: