These are some questions from a AS Core 1 Practise Paper and I don't have a clue what to do.I had a go at B a few times and got a few different answers based around root7.

A) Given that 3^x = 9^(y-1) , show that x=2y-2.

B) Solve the simulatious eqs, x=2y-2

x^2=(y^2)+7

C) Find a set of values for x for which 6x-7 < x+3 and (2x^2)+7x -4 >0

I had a go at C and solved each equation, x<2 and -4<x<1/2 but wasn't sure what to do when it says find a set of values for both.

Sorry I'm not sure how to write powers properly on computors

Thanks