Answer
See graph
Work Step by Step
$-x+9=-y$
$-x+y=-9$
Find the x-intercept by substituting 0 for y.
$-x=-9$
$x=9$
$(9,0)$
Find the y-intercept by substituting 0 for x.
$y=-9$
$(0,-9)$
Plot these points and connect with a straightedge.