17. straight line y = ax(a & gt；; 0) and hyperbola y=3/x intersect at a (x 1, y 1) and b (x2, y2), then 4x1y2-3x2y1= _ _

From the meaning of the question, the image is the intersection of a proportional function and an inverse function, so the abscissa and ordinate of the two intersections have a special relationship.

X 1=-x2, y 1=-y2, the original formula =-4x1y1+3x1y1=-x1y65448.

So the answer is -3.