exam Maths Puzzle Numerical Ability

What is the locus of points in a plane equidistant from two parallel lines?

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Can someone please help me on this problem? I am lost on this.

I need to find the constant of variation k

M varies directly with N; M = 144 when N = 8

Thank,
She Bob is 24 years younger than his father. In 2 years he will be half as old as his father. How old is each now?