问题标题:
Inthexy-coordinateplane,linesLandQareperpendicular.IflineLcontainsthepoints(0,0)and(2,1),andlineQcontainsthepoints(2,1)and(0,T),whatisthevalueof
问题描述:

Inthexy-coordinateplane,linesLandQareperpendicular.IflineLcontainsthepoints(0,0)and(2,1),andlineQcontainsthepoints(2,1)and(0,T),whatisthevalueof

邓三鹏回答:
  L和Q垂直.   L过(00)(2,1)所以L这条线是y=0.5x,所以Q的斜率是-2,对吧.因为垂直斜率是负倒数.   Q过(2,1)(0,t)所以-2(2)+t=1推出t=5   那个题我帮你答了,自己去链接看.
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