book Maths Puzzle Numerical Ability

How do I work this equation, y= 1/x-2 if x= -2, -1, 0, 1, 2, 3?

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book Other Question

How many ways can a president, vice president, secretary, and treasurer be chosen from a club with nine members? - 3x - 5y + z = 2; 2x - z = 3; x + 2y + z = 8.