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歡迎您訪問數學考題練習:如果點A(2,6)在函數y=kx的圖象上,下列!

數學考題練習:如果點A(2,6)在函數y=kx的圖象上,下列

更新時間:2024-01-12 16:39:36作者:貝語網校

如果點A(2,6)在函數y=kx的圖象上,下列所表示的各點在這個函數圖象上的是

A.(-1,-2)

B.(-2,6)

C.(1,3)

D.(3,-9)

試題答案

C

試題解析

將點A(2,6)代入函數解析式求k,再把點的坐標代入解析式,逐一檢驗.

解答:把點A(2,6)代入y=kx中,

得2k=6,解得k=3;

所以:y=3x,

四個選項中,只有C符合y=3×1=3.

故選C.

點評:用待定系數法求函數解析式是確定解析式常用的方法.

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