Alevel数学题?1.Pisthepoint(7.5)an-查字典问答网
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  Alevel数学题?1.Pisthepoint(7.5)andL1isthelinewithequation3x+4y=16(1).FindouttheequationofthelineL2whichpassesthroughPandisperpendiculartoL2.(2).FindthepointofintersectionoftheL1andL2.(3).Findtheperpendicular

  Alevel数学题?

  1.Pisthepoint(7.5)andL1isthelinewithequation3x+4y=16

  (1).FindouttheequationofthelineL2whichpassesthroughPandisperpendiculartoL2.

  (2).FindthepointofintersectionoftheL1andL2.

  (3).FindtheperpendiculardistanceofPfromthelineL1.

3回答
2020-04-2419:44
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马美娜

  (1)perpendiculartoL1吧?

  L2:4x-3y=13

  (2)(4,1)

  (3)d=(/3*7+4*5-16/)/5=5

  (1)问就是求过P且与L1垂直的直线L2

  (2)问就是求L1与L2的交点

  (3)问就是求P到L1的距离

2020-04-24 19:45:46
毕滨增

  为什么是(4,1))我怎么是(0.25,-4)

2020-04-24 19:46:59
马美娜

  3x+4y=16(1)4x-3y=13(2)两式相加得7x+y=29,则y=29-7x,代回2式得4x-87+21x=13,即25x=100,x=4。y=1。

2020-04-24 19:48:11
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