已知y1=6-x,y2=2+7x,当x取何值时,y1比y2小-3

问题描述:

已知y1=6-x,y2=2+7x,当x取何值时,y1比y2小-3

1.y1=6-x,y2=2+7x ,y1=y2-3
6-x=2+7x-3 => 8x=7 => x= 7/8