begin by solving for y, we get: y = 5 - x
the y-intercept is the lone constant, so the line passes through (0,5)
for the x-intercept, set y = 0 and solve for x. we find that the x -intercept is 5 as well, so the line passes through (5,0)
so plot these two points on the axis and draw a straight line through them and you're done.
now, do the other