exam Maths Puzzle Numerical Ability

I am having difficulty graphing the following inequality.
3x-4y<12

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exam Other Question

Find the value of x in the inequality ]x-7[ is less than or equal to 2.
NOTE- ][ are absolute value signs.
Thanks,
Pat Simplify:

sqrt 20 1
------- - ---------
5 sqrt 5

I do not believe that this can be simplifed, but is there a way to simplify this? Thank you for your help!!