Answer
Slope: $m=-1$
y-intercept: $(0,-10)$
Work Step by Step
In a linear equation $y=mx+b$, $m$ is the slope and $(0,b)$ the y-intercept. That is, the y-intercept is the point on the line when $x=0$.
$y=-x-10$
Slope: $m=-1$
y-intercept: $(0,-10)$