book Maths Puzzle Numerical Ability

y= - 3x -1 how do you do this?

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book Other Question

4, 2, 3, 4, 6, 2, 4, .... what will be the next number??? Given the function f(x)=x^2-3, x is greater than or equal to 0. Find the inverse function, f^-1(x) and graph both functions.