若Y1=-X+3,Y2=3X-4 ,试确定当X取何值时:(1)Y1小于Y2 (2)Y1等于Y2 (3)Y1大于Y2

问题描述:

若Y1=-X+3,Y2=3X-4 ,试确定当X取何值时:(1)Y1小于Y2 (2)Y1等于Y2 (3)Y1大于Y2

(1)
-x+34+3
4x>7
x>7/4
当x>7/4Y1小于Y2
(2)
-x+33x-4
x