CPM Homework Help : CALC Problem 5-31

Graph $y = | x + 1 | + | x - 2 |$ . For what value of $x$ does $y$ achieve its minimum value? What characteristic of this function makes the answer to this question unusual?

Graph:

Hint:

It is possible for a function to have more than one global extrema. For example, any horizontal line has infinitely many minimums and maximums.