Symmetric description of scaling and translation
If y = f(x), then f((x-h)/A) scales the function horizontally by A and translates it horizontally by h.
Similarly, ((y-k)/B) = f(x) scales the function vertically by B and translates it vertically by k.
Note that this expression is equivalent to y = B f(x) + k, which may seem more intuitive, but grouping the parameters with y makes the notation symmetric, so we could in general write:
((y-k)/B) = f((x-h)/A).