What is the slope of the common chord of the circles x2+y2=4x^2 + y^2 = 4x2+y2=4 and x2+y2−4x−6y+4=0x^2 + y^2 - 4x - 6y + 4 = 0x2+y2−4x−6y+4=0?
−23-\frac{2}{3}−32
23\frac{2}{3}32
−32-\frac{3}{2}−23
32\frac{3}{2}23