已知y1=6-x,y2=2+7x,当x取何值时,y1与y2互为相反数?此题求已知y1=6-x,y2=2+7x,当x取何值时,y1与y2互为相反数?

已知y1=6-x,y2=2+7x,当x取何值时,y1与y2互为相反数?此题求已知y1=6-x,y2=2+7x,当x取何值时,y1与y2互为相反数?
已知y1=6-x,y2=2+7x,当x取何值时,y1与y2互为相反数?此题求
已知y1=6-x,y2=2+7x,当x取何值时,y1与y2互为相反数?

已知y1=6-x,y2=2+7x,当x取何值时,y1与y2互为相反数?此题求已知y1=6-x,y2=2+7x,当x取何值时,y1与y2互为相反数?
6-x+2+7x=0
-x+7x=-6-2
6x=-8
x=-3/4
当x=-3/4时,
y1与y2互为相反数

y1+y2=6-x+2+7x=8+6x=0;
所以解得：x=-4/3

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