1) Since the product of the intercepts is positive, both intercepts must either intersect the x-axis in the positive or negative array.
If both intersect the x-axis in the negative array, the slope of both lines must be positive.
If they intersect the x-axis in the positive array, they can either have a positive or negative slope ( one can even be negative while the others is positive*), depending on if they intersect left or right from the point (4,3)
Thus statement 1 is insufficient
2) The one that intersects the y-axis in the negative array has to have a positive slope, the other one, which intersects in the positive array, has to have a negative slope. Thus sufficient. It's B
File comment: sorry for my graphics, can't do them better
Unbenannt.JPG [ 14.08 KiB | Viewed 557 times ]