I do believe 9 and 3<span />
For AC = 6y - 1,
y = 1/6 + AC/6
For BD = 4y + 13,
y = -13/4 + BD/4
The point slope equation should be y+1=2(x-6)
Because it says "not black" we would do white marbles
There are 15 white marbles and a total of 20
So the fraction of white marbles to total would be 15/20
Because the answer is wanted as a decimal divide 15 by 20
15/20=.75
There is a .75 chance that she will not draw a black marble
