如图4,一次函数y1=mx+n(m≠0)与二次函数y2=ax2+bx+c(a≠0)的图

如图4,一次函数y1=mx+n(m≠0)与二次函数y2=ax2+bx+c(a≠0)的图象相交于两点A(-1,5)、B(9,3),请你根据图象写出使y1≥y2成立的x的取值范围
A.-1≤x≤9B.-1≤x<9
C.-1<x≤9D.x≤-1或x≥9

答案

A解析:
由图像可知当-1≤x≤9 时,直线在抛物线上方,即
y1≥y2故选A。

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