已知两条直线l1:ax-by+4=0,l2:(a-1)x+y+b=0,求分别满足下列条件的a,b的值已知两直线l1:ax-by+4=0,l2:(a-1)x+y+b=0.求分别满足下列条件的a,b的值.(1)直线l1过点(-3,-1),并且直线l1
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![已知两条直线l1:ax-by+4=0,l2:(a-1)x+y+b=0,求分别满足下列条件的a,b的值已知两直线l1:ax-by+4=0,l2:(a-1)x+y+b=0.求分别满足下列条件的a,b的值.(1)直线l1过点(-3,-1),并且直线l1](/uploads/image/z/10145754-18-4.jpg?t=%E5%B7%B2%E7%9F%A5%E4%B8%A4%E6%9D%A1%E7%9B%B4%E7%BA%BFl1%EF%BC%9Aax-by%2B4%3D0%2Cl2%3A%28a-1%29x%2By%2Bb%3D0%2C%E6%B1%82%E5%88%86%E5%88%AB%E6%BB%A1%E8%B6%B3%E4%B8%8B%E5%88%97%E6%9D%A1%E4%BB%B6%E7%9A%84a%2Cb%E7%9A%84%E5%80%BC%E5%B7%B2%E7%9F%A5%E4%B8%A4%E7%9B%B4%E7%BA%BFl1%EF%BC%9Aax%EF%BC%8Dby%EF%BC%8B4%EF%BC%9D0%2Cl2%EF%BC%9A%EF%BC%88a%EF%BC%8D1%EF%BC%89x%EF%BC%8By%EF%BC%8Bb%EF%BC%9D0%EF%BC%8E%E6%B1%82%E5%88%86%E5%88%AB%E6%BB%A1%E8%B6%B3%E4%B8%8B%E5%88%97%E6%9D%A1%E4%BB%B6%E7%9A%84a%2Cb%E7%9A%84%E5%80%BC%EF%BC%8E%EF%BC%881%EF%BC%89%E7%9B%B4%E7%BA%BFl1%E8%BF%87%E7%82%B9%EF%BC%88%EF%BC%8D3%2C%EF%BC%8D1%EF%BC%89%2C%E5%B9%B6%E4%B8%94%E7%9B%B4%E7%BA%BFl1)
已知两条直线l1:ax-by+4=0,l2:(a-1)x+y+b=0,求分别满足下列条件的a,b的值已知两直线l1:ax-by+4=0,l2:(a-1)x+y+b=0.求分别满足下列条件的a,b的值.(1)直线l1过点(-3,-1),并且直线l1
已知两条直线l1:ax-by+4=0,l2:(a-1)x+y+b=0,求分别满足下列条件的a,b的值
已知两直线l1:ax-by+4=0,l2:(a-1)x+y+b=0.求分别满足下列条件的a,b的值.
(1)直线l1过点(-3,-1),并且直线l1与l2垂直;
已知两条直线l1:ax-by+4=0,l2:(a-1)x+y+b=0,求分别满足下列条件的a,b的值已知两直线l1:ax-by+4=0,l2:(a-1)x+y+b=0.求分别满足下列条件的a,b的值.(1)直线l1过点(-3,-1),并且直线l1
因为L1过(-3,-1),所以,带入得:-3a+b+4=0,即,b=3a-4;
有因为L1与L2垂直,K1=a/b ,K2= 1-a,则,K1*K2 =-1,即(1-a)*a/b=-1,即,b=a*(a-1);
将b=3a-4带入即得3a-4=a^2-a,解一元二次方程a^2-4a+4=0,得,a=2;
那么,b=2.
所以,a=2,b=2.
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