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=2x+8,y2=6-2x.当x取何值时,y1=y2? 已知y1=2x+8 y2=6-2x 当x取何值时,y1=y2 当x取何值时,y2-y1=5已知y1=2x+8 y2=6-2x 当x取何值时,y1=y2 当x取何值时,y2-y1=5 已知y1=2x²+7x-1,y2=x²+6x+2当x取何值时,y1=y2 已知y1=2x²+7x-1,y2=6x+2,当x取何值时y1=y2 1.已知y1=2x²+7x-1,y2=6x+2,当x取何值时y1=y2? 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比y2小-3 已知y1=3x-2,y2=3+2x.当x取何值时,y1=y2? 已知：y1=3x-2,y2=3+2x.当x取何值时,y1=y2 已知Y1=3X+2 Y2=-2X+4当X取何值时.Y1大于Y2 已知y1=6-x,y2=2+7x,诺（1）y1=2y2,球x的值；（2）当x取何值是,y1与y2互为相反数 已知y1=5x-8,y2=12x+6,当x取何值时1/2y1-1/3y2=2x 已知y1=5x-8,y2=12x+6当x取何值时,y1-1/3y2=2x 已知y1=5x-8,y2=12x+6,当x取何值时,y1-1/3y2=2x? 已知y1=6-x,y2=2+7x.(1)当x取何值时,y1=2y2?(2)当x取何值时,y1比y2小-3?（3）当x取何值时,y1与y2互为相反数? 已知y1=2x+8,y2=6-2x （1）当x取何值时,y1=y2? （2）当x取何值时,y1比y2小10 已知y1=2x+8,y2=6-2x.(1).当x取何值时,y1=y2?（2）.当x取何值时,y1比y2小5? 已知,y1=2x+8,y2=6-2x(1)当x取何值时,y1=y2(2)当x取何值时,y1比y2小5