book Maths Puzzle Numerical Ability

I need more help on these please. you solvers are great!
Can you solvers also tell me if these problems are POLYNOMIALS, LINEAR, PARABOLA, TRINOMIALS, BINOMIALS, QUADRATIC EQUATI

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book Other Question

If x varies inversely as y and x == 2 when y = 8, find x when y =17. please help me with this problem i have no idea how to get the answer and i have been working on it for an hour. solve the system of equations.
3x+4y+z=7
2y+z=3
-5x+3y+8z=-31
thank you!!!