(1) (-2,3) (2)l1//l2 (3)l1=l2
(1)a=3 c不等于-2 (2)a不等于3 (3)a=-4/3
(1)m不等于-1,-7 (2)m1=-1 m2=-7 (3)m=-13/3
令交于(x0,y0),代入得A1X0+B1Y0+C1=A2X0+B2Y0+C2=0 前一个等式乘以λ加后一个等式可得A1X0+B1YO+C1+λ(A2X0+B2Y0+C2)=0
(1) 2X+3Y-2=0 (2)4X-3Y-6=0
(1) (-2,3) (2)l1//l2 (3)l1=l2
(1)a=3 c不等于-2 (2)a不等于3 (3)a=-4/3
(1)m不等于-1,-7 (2)m1=-1 m2=-7 (3)m=-13/3
令交于(x0,y0),代入得A1X0+B1Y0+C1=A2X0+B2Y0+C2=0 前一个等式乘以λ加后一个等式可得A1X0+B1YO+C1+λ(A2X0+B2Y0+C2)=0
(1) 2X+3Y-2=0 (2)4X-3Y-6=0