,已知y1=5x+2,y2=4-3x 当x取何值时y1=y2?当X取何值时y1比y2大5?

问题描述:

,已知y1=5x+2,y2=4-3x 当x取何值时y1=y2?当X取何值时y1比y2大5?

tt葩葩tt :
当y1=y2时,
即5x+2=4-3x
5x+3x=4-2
8x=2
x=1/4
当y1比y2大5时,
即5x+2=4-3x+5
5x+3x=9-2
8x=7
x=7/8