I was also given these:
I've been trying to manipulate this as a system of equations, but it's just not working out for me. I found a similar problem on this site, but instead of $pq$ and $p-q$ being known, it had $pq$ and $\phi(pq)$, so that didn't help. The $\phi(n)$ function has never been mentioned in this class before, so I can't use any definitions of it (aside from the one given above) without proving them. Could someone please point me in the right direction here?