It is easy, but you need to find either p or q first and use it to solve for the other one. So, if you have

Say you want P for the first equation so you have to get P on one side alone...

Divide out your 2 to get P alone.

Which reduces to p=3+3q/2

Now, you have P so find Q by putting the value of P in the other equation...

and I think you can figure out the rest.