book Maths Puzzle Numerical Ability

how do you graph f(x) = |x| / [[x]] ? when [[ ]] means greatest ingeter function.

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book Other Question

how many centimeter in one decimeter This question is on elimination...
4x-2y=-14
3x-y=-8

My answer was (-2 7/10,-12 4/10) Is this right, because it looks way too big to be the answer
thanks