When x=0 y=0, which is the origin for the graph, a straight line with a slope of -5 (\) passing through the origin (0,0). You need another point to establish the line sufficiently to draw it. When x=-1 y=5 so join the point (-1,5) to the origin by drawing the line through both points. The x and y intercepts are both zero. You should find the line passes through another point (1,-5) where x=1 and y=-5.