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歡迎您訪問數學考題練習:已知一次函數y1=(m2-2)x+1-m與y2!

數學考題練習:已知一次函數y1=(m2-2)x+1-m與y2

更新時間:2024-01-12 14:02:03作者:貝語網校

已知一次函數y1=(m2-2)x+1-m與y2=(m2-4)x+2m+3的圖象與y軸交點的縱坐標互為相反數,則m的值為

A.-2

B.2

C.-3

D.-4

試題答案

D

試題解析

分別求出兩圖象與y軸交點,然后使其縱坐標相加為零,即可解得m的值.

解答:根據題意,把x=0分別代入兩函數解析式得:

y1=1-m,y2=2m+3,即為與y軸交點的縱坐標,

∴由y1、y2互為相反數得:y1+y2=1-m+2m+3=0,

解得:m=-4;

故選D.

點評:本題考查一次函數圖象上點的坐標特征,是基礎題型.

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