book Maths Puzzle Numerical Ability

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!!!

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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 {{{bx^2+bx+a^2}}} where a and b are constants, and x is the unknown.