已知y1=5x+2,y2=1/2x-3.当x取何值时y1=y2?当X取何值时y1比y2小3?

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/05 15:47:41

已知y1=5x+2,y2=1/2x-3.当x取何值时y1=y2?当X取何值时y1比y2小3?
已知y1=5x+2,y2=1/2x-3.
当x取何值时y1=y2?
当X取何值时y1比y2小3?

已知y1=5x+2,y2=1/2x-3.当x取何值时y1=y2?当X取何值时y1比y2小3?
5x+2=1/2x-3
9/2x+5=0
9/2x=-5
x=-10/9
5x+2=1/2x-3-3
x=-16/9

5x+2=1/2x-3
得x=-9/10
(2)-16/9