exam Maths Puzzle Numerical Ability

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

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WORD PROBLEM:

How much water should be added to 8 ML of 6% Saline solution to reduce the concentration to 4%?

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