Answer
The slope is $-1$.
The $y$-intercept is $0$.
Refer to the graph below.
Work Step by Step
The slope of the line can be obtained by looking at the coefficient of $x$ in the slope-intercept form.
Isolate $y$ to obtain:
$x+y=0$
$y=-x$
Thus, the slope is $-1$.
By definition, the $y$-intercept is the constant in the slope-intercept form of the equation.
For $y=-x$ , the constant is $0$, therefore the $y$-intercept is $0$.
Plot the point $(0, 0)$.
Then using the slope, which is $-1$, move $1$ unit to the right and $1$ unit down to reach $(1, -1)$.
Connect the two points using a straight line to complete the graph.
Refer to the graph above.
