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歡迎您訪問數學考題練習:如圖,反比例函數y=(m≠0)的圖象過點E(2!

數學考題練習:如圖,反比例函數y=(m≠0)的圖象過點E(2

更新時間:2024-01-12 16:29:34作者:貝語網校

如圖,反比例函數y=(m≠0)的圖象過點E(2,-6),一次函數y=kx+b(k≠0)的圖象分別與x軸、y軸交于點B、C,與y=的圖象在第二象限交于點A,過點A作AD⊥OX,垂足為D,且OB=OD=OC.求反比例函數及一次函數的解析式.

試題答案

解:∵點E(2,-6)在y=上

∴-6=,

∴m=-12(3分)

設B(a,0),由OD=OB=OC知,

D(-a,0),C(0,2a)(4分)

∵AD⊥Ox

∴CO∥AD

∴AD=2OC,

∴AD=4a即A(-a,4a)

又A在y=上

∴4a=,

∴a2=3,

∴a=±,(負值舍去)(7分)

∴B(,0),C(0,2),

又∵B、C在y=kx+b上,

∴O=k+b,2=b

∴k=-,b=2,

∴所求一次函數的解析式為:y=-x+2.(9分)

故答案為:y=、y=-x+2.

試題解析

將E(2,-6)代入y=,求出m的值,即可求出反比例函數解析式;設B點坐標為(a,0),由OD=OC=OB,AD⊥Ox可用a分別表示出A、D、C三點的坐標,由A在反比例函數的圖象上可求出a的值,進而求出各點坐標,把B、C兩點的坐標代入一次函數y=kx+b即可求出此函數的表達式.

點評:本題考查的是反比例函數與一次函數的交點問題,先用待定系數法求出反比例函數的解析式,再由已知條件分別設出A、B、C、D各點的坐標是解答此題的關鍵.

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