Answer
$\text{slope}=m=-1;
\\\text{y-intercept}=b=1$
Refer to the image below for the graph.
Work Step by Step
RECALL:
The slope-intercept form of a line's equation is:
$y=mx+b$
where $m$ = slope and $b$ = y-intercept
Write the given equation in slope-intercept form by isolating $y$ on one side to obtain:
$x+y=1
\\y=-x+1$
The equation above has:
$\text{slope}=m=-1;
\\\text{y-intercept}=b=1$
To graph the line, perform the following steps:
(1) Plot the y-intercept point $(0, 1)$.
(2) Use the slope of $-1$ to find another point on the line.
From $(0, 1)$, move down 1 unit (the rise) and move 1 unit to the right (the run) to arrive at the point $(1, 0)$.
(3) Complete the graph by connecting the two points using a straight line.
(refer to the attached image in the answer part above for the graph)