The solution of the equation system | x+ 1 |+x- 1 | = b means that straight lines have intersections, or x, a, b A and b can be found to make the equation hold.
1: when x ≥ 1, | x+ 1 |+x- 1 | = 2x.
|x- 1|=x- 1
Y=2x and y=x- 1 do not intersect.
2:- 1≤x≤ 1，| x+ 1 |+x- 1 | = 2。
|x- 1|= 1-x
The intersection of y=2 and y= 1-x is x=- 1.
3:x & lt； At - 1，| x+ 1 |+x- 1 | =-2x
|x- 1|= 1-x
Y=2 and y= 1-x do not intersect.
So the solution of the equation is x=- 1.
a=2
b=2