@Kitonum 

Wow, this is super helpful! Thanks so much for your time :) 

@Markiyan Hirnyk 

Thanks anyway!

For anyone else that looks, I realised it's only plotting one solution of T, for every value of n2 but sometimes there is more than one value, any ideas?!

@Markiyan Hirnyk 

Thank you so much!

If it doesn't take too long for you to do, could you possibly show me how I'd plot only the biggest values for T and S?

Thanks again!

@Markiyan Hirnyk 

Wow, thanks for the help!

It's not so much that I want solutions of n2, its more putting values of n2 (from 0 to 3 ish) into the two equations and then plotting the solutions of T and S against the value of n2 that got the solutions. (I'm not sure if thats what the directsearch does - i'm such a maple newbie!) I should get a continuous graph and n2 > 0, but thats all i know. 

I'm not sure if thats helpful?!