Answer
m=$-\displaystyle \frac{2}{3}$,
fill y = $-3$
Work Step by Step
From the two points ($0.,-1)$ and $(6,-5)$
$m=\displaystyle \frac{\Delta y}{\Delta x}=\frac{change\ in\ y}{change\ in\ x}\\\\=\dfrac{-5-(-1)}{6-0}=\dfrac{-4}{6}=-\dfrac{2}{3}$,
which we read also as:
"for a change of x of $+3$, y changes by $-2$" (rise and run)
So, when x changes from $0$ to $3$, (by $+3$)
y will change from $-1 $ to $-3$ (by $-2$).
Missing point: ($3,-3$)
