what is the difference between a vertical stretch and a horizontal compression?
A vertical compression (or shrinking) is the squeezing of the graph toward the x-axis. if k > 1, the graph of y = k•f (x) is the graph of f (x) vertically stretched by multiplying each of its y-coordinates by k. ... A horizontal compression (or shrinking) is the squeezing of the graph toward the y-axis.