exam Maths Puzzle Numerical Ability

how do I find the inverse of x->3x??? and x->3x-5
Is there a formula I can use? thankyou

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exam Other Question

A plane flies 480 miles with the wind and 320 miles against the wind in the same length of time. If the speed of the wind is 28mph, what is the speed of the plane in still air? Which of the following is not a true statement about lines in a plane?
a. Lines continue forever in both directions.
b. All lines are curves
c. Any two lines must either interse