Stretches of graphs

Being able to transform basic graphs is an essential skill to develop for sketching graphs.
Here I look at stretches to graphs of the form y = f(x).

Why does y = af(x) stretch y = f(x) by scale factor a parallel to the y-axis?

Why does y = f(ax) stretch y = f(x) by scale factor 1/a parallel to the x-axis?




2018-08-07T14:49:24+00:00
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