book Maths Puzzle Numerical Ability

in the function y=3x-4 what is the value of the dependent variable when the independent variable is -2?

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book Other Question

The sum of four consecutive odd intergers is 96.
Find the intergers. Must show Equation
Would you show me how to simplify the expression: x-(2/x+1)/x-(4x-2/x+1)? Thank you