Slope: -1; y-intercept: (0,0)
Work Step by Step
We are given the line $y=-x=-x+0$. This line is written in the slope-intercept form $y=mx+b$ (where m is the slope of the line, and the point $(0,b)$ is the y-intercept). Therefore, the slope of this line is $-1$ and the y-intercept is $(0,0)$.