The slope intercept form is:
y = mx + b
Where
m is slope
b is y intercept
Since, slope = -5, we can write:
y = -5x + b
It goes through (8,4), so we plug it in and find the equation (with b):
[tex]\begin{gathered} y=-5x+b \\ 4=-5(8)+b \\ 4=-40+b \\ b=40+4_{}_{} \\ b=44 \\ \text{Hence} \\ y=-5x+44 \end{gathered}[/tex]
