Question 527897
{{{y=-x+5}}} is the equation of a straight line.
All you need to do is to find two points in that line and connect them.
You could pick {{{x=0}}} to find the corresponding {{{y=5}} value for {{{y}}} as one of the points.
You could pick any other value of {{{x}}} for another point. Maybe {{{x=5}}} that corresponds to {{{y=0}}}.
The lines continues infinitely in both directions, so make sure you indicate that on your graph. Often that is done by drawing the line as long as reasonable and putting arrowheads at the ends.