exam Maths Puzzle Numerical Ability

3a+4-{-2-[-3-(a-1)]}

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how do I graph 2y+5x=-2

I came up with (0,-1) and (-2/5,0) but do not know if it is correct and if so how to graph A community hall has an area of 396 metres squared. A 12 metre by 16 metre rug is placed on the floor so that the width of the floor showing on the four sides is uniform. What is the distance between the rug and the wall ?