(1) 代入(-1,-5),(2,4):-k1 + b1 = -52k1 + b1 = 4k1 = 3,b1 = -2y1 = 3x -2y2=k2x+b2的图像与直线y=2x平行,k2 = 2y2 = 2x + b2代入(-1,1):1 = -2 + b2b2 = 3y2 = 2x + 3(2) y1 = 3x -2 > 0,x > 2/3y2 = 2x + 3 > 0,...