y = |x| has vertex (0, 0).
When you replace x with x - h, the graph of the function shifts h units horizontally.
y = |x - h| + k
y - k = |x - h|
When you replace y with y - k, the graph shifts k units vertically.
The vertex moves from (0, 0) to (h , k).
The answer is (h, k).
