If a line has no y intercept what can you say about the line? What if no X?

Try drawing a bunch of lines on graph paper with different slopes and see if any of them could result in either no y-intercept or no x-intercept. Actually if you look at the lines printed on graph paper that should give you a good hint.

any two non-equivelent lines drawn on a cartesian graph are either parallel or intercept at one point, and that includes the x or y-axis. If you tell me more about what you know about intercepts, I'll tell you more about what you're asking.