The reason is: Because this line passes through the origin. In other words, both the x-intercept and the y-intercept are zero. The two intercepts coincide, so they give you only one point on the line, and that's not enough information to draw the line.
So the intercepts are when the point is at that axis or when the other axis is zero so set each to zero if x=0 then y=0 vice verca doesn't help much you would need slope to help
