How do you do these questions?

Iam so stuck. what is the worked out answer for this question?

Which system of linear inequalities is represented by the graph? x-3y > 6 and y? 2x + 4 x + 3y > 6 and y? 2x - 4 x - 3y > 6 and y? 2 - 4 x + 3y > 6 and y > 2x + 4 no be 2 -1.1 1 2 3 4 5 submit save and exit next mark this and retum be

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?