book Maths Puzzle Numerical Ability

- 3x - 5y + z = 2; 2x - z = 3; x + 2y + z = 8.

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book Other Question

How do I work this equation, y= 1/x-2 if x= -2, -1, 0, 1, 2, 3? Can you give me two formulas for both arithmetic and geometric? I will need both the term and sum formula.