Answer
$\text{Slope: }
-\dfrac{3}{8}
\\\\\text{$y-$intercept: }
4$
Work Step by Step
Using $y=mx+b$ where $m$ is the slope and $b$ is the $y-$intercept, then the equation $
y=-\dfrac{3}{8}x+4
$ has the following characteristics:
\begin{array}{l}\require{cancel}
\text{Slope: }
-\dfrac{3}{8}
\\\\\text{$y-$intercept: }
4
.\end{array}