直线y=4x过点(-1,m):m = 4(-1) = -4将(3,-3),(-1,-4)代入y = kx +b3k + b = -3 (1)-k + b = -4 (2)联立(1)(2):k = 1/4,b = -15/4y = x/4 -15/4斜率为正,在y轴上的截距为负,其图像过第1,4,3象限分别取x = 0,y = 0,可...