Help please. Find the measure of each angle

There are 20 children in the cast of a class play and 8 of the children are boys of the boys 4 have a speaking part in the play and of the girls 8 do not have a speaking part in the play if a child from the cast of the place chosen at random what is the probability that the child has a speaking part

Which ahows the graph of the solution set of 6x+4y< 12

Which value of y will make the inequality y< -1 false?