Question

已知y1等于二分之一x+1,y2等于-x+3.（1）当x取何值时,y1=y2?（2）当x取何值时,y1与y2的和为0?

Answer 1

1.1/2(x+1)=-x+3 3x=5 x=5/3

2.1/2(x+1)+(-x+3 )=0 x=7

3.1/2(x+1)-(-x+3 )=-2 x=11