设y1=1/5x+1,y2=(2x+1)/3,当x为何值时,y1,y2绝对值相等?

Question

设y1=1/5x+1,y2=(2x+1)/3,当x为何值时,y1,y2绝对值相等?

Answer 1

绝对值相等
则1/5x+1=(2x+1)/3
3/5x+3=2x+1
7/5x=2
x=10/7
或者1/5x+1=-(2x+1)/3
3/5x+3=-2x-1
13/5x=-4
x=-20/13
所以
x=10/7,x=-20/13