Answer
\begin{array}{l}\require{cancel}
\text{Slope-Intercept Form: }
y=-5x+4
\\\text{Slope: }
-5
\\\text{$y$-intercept: }
(0, 4)
\end{array}
Work Step by Step
Using the properties of equality, the given equation, $
5x+y=4
,$ is equivalent to
\begin{array}{l}\require{cancel}
5x+y=4
\\
y=-5x+4
.\end{array}
Using $y=mx+b$ (where $m$ is the slope and $(0, b)$ is the $y$-intercept) or the Slope-Intercept Form of linear equations, then the equation above has the following properties
\begin{array}{l}\require{cancel}
\text{Slope-Intercept Form: }
y=-5x+4
\\\text{Slope: }
-5
\\\text{$y$-intercept: }
(0, 4)
.\end{array}