book Maths Puzzle Numerical Ability

What is the reclusive formula?

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Please help!
2) The volume of a cylinder (think about the volume of a can) is given by V = πr2h where r is the radius of the cylinder and h is the height of the cylinder. Sup
How would I write an equation of the line parallel to the line l and which passes through point P?
ex: l: y=2x-4 P(2,5)
ex: l: y=1/2x+5 P(o,4)