book Maths Puzzle Numerical Ability

I'm supposed to graph 2y-4x<8 but dont know how to find the x and y points.

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book Other Question

A merchant purchased a jacket for $60 and then determined a selling price that equalled the purchase price of the jacket plus a markup that was 25 percent of the selling price. Du i=sqrt(p/r) if p=500 ,r=25. would that make the answer 20 ?