exam Maths Puzzle Numerical Ability

find the shortest distance between the parallel lines with equations 5x-12y+33=0 and 5x-12y-6=0

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exam Other Question

rewrite 14x-7y=21, so that y is a function of x
rewrite 8x+2y=14, so that y is a function of x given f(x)= 4x/x+2, find f-1(x) (inverse of function x)