已知y1=-2/3x+1,y2=5-1/6x,若y1-y2=20,则x=
问题描述:
已知y1=-2/3x+1,y2=5-1/6x,若y1-y2=20,则x=
答
y1-y2=20
-2/3x+1-5+1/6x=20
(1/6-2/3)x=20+5-1
(1/6-4/6)x=24
-3/6x=24
-1/2x=24
x=-48
答
因为Y1+Y2=20
1/6x-5-2/3x+1=20
-1/2x-4=20
-1/2x=24
-1x=48
x=-48满意采纳。thanks
答
由题意知
-2/3x+1+1/6x-5=20
整理得
-1/2x=24
x=-48