(1)把(0,0)代入y=(1-3k)x+2k-1 得 2k-1=0 → k=0.5
(2)(0,-2)代入y=(1-3k)x+2k-1 得 2k-1=-2 → k=-0.5
(3)(3/4,0)代入y=(1-3k)x+2k-1 得 k=-1
(4)一次项系数大于0,y随x增大而增大,即1-3k>0 → k<1/3
(5)两直线平行,一次项系数相等,1-3k=-3 → k=4/3
(1)把(0,0)代入y=(1-3k)x+2k-1 得 2k-1=0 → k=0.5
(2)(0,-2)代入y=(1-3k)x+2k-1 得 2k-1=-2 → k=-0.5
(3)(3/4,0)代入y=(1-3k)x+2k-1 得 k=-1
(4)一次项系数大于0,y随x增大而增大,即1-3k>0 → k<1/3
(5)两直线平行,一次项系数相等,1-3k=-3 → k=4/3