设y1=2x+1,y2=x-1/4,当x为何值时,y1与y2互为相反数

Question

设y1=2x+1,y2=x-1/4,当x为何值时,y1与y2互为相反数

Answer 1

y1+y2=0
2x+1+(x-1)/4=0
8x+4+x-1=0
9x=-3
x=-1/3