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歡迎您訪問數學考題練習:如圖所示,直線l的解析式是!

數學考題練習:如圖所示,直線l的解析式是

更新時間:2024-01-12 16:37:37作者:貝語網校

如圖所示,直線l的解析式是

A.y=x+2

B.y=-2x+2

C.y=x-2

D.y=-x-2

試題答案

A

試題解析

直線經過點(-2,0)和點(0,2)),用待定系數法可求出函數關系式.

解答:直線經過點(-2,0)和點(0,2),

因而可以設直線的解析式是y=k+b,

把點的坐標代入得到,

解得,

因而直線l的解析式是y=x+2.

故選A.

點評:本題主要考查了利用待定系數法求函數的解析式,待定系數法是求函數的解析式的最常用的方法.

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