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歡迎您訪問數學考題練習:一次函數y=2x-4的圖象一定不經過點!

數學考題練習:一次函數y=2x-4的圖象一定不經過點

更新時間:2024-01-12 16:34:47作者:貝語網校

一次函數y=2x-4的圖象一定不經過點

A.(2,0)

B.(0,-4)

C.(3,2)

D.(4,2)

試題答案

D

試題解析

根據一次函數圖象上點的坐標特點把各點分別代入函數解析式即可.

解答:A、∵2×2-4=0,∴一次函數的圖象一定經過此點,故本選項錯誤;

B、∵2×0-4=-4,∴一次函數的圖象一定經過此點,故本選項錯誤;

C、∵2×3-4=2,∴一次函數的圖象一定經過此點,故本選項錯誤;

D、∵2×4-4=4≠2,∴一次函數的圖象一定不經過此點,故本選項正確.

故選D.

點評:本題考查的是一次函數圖象上點的坐標特點,即一次函數圖象上各點的坐標一定適合此函數的解析式.

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