exam Maths Puzzle Numerical Ability

Solve the inequality

/3x -9/ < 12 (//represents absolute value)

Express the answer in terms of intervals

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exam Other Question

I need to know how to create a set of linear equations which go through the point (1,2). I can get a ghetto answer by graphing the point and creating some lines, but I want to know how to do the problem right.
thanks
A function f is given.
f(x) = -x + 10


(a) Find f^ -1.