y = f(x - a)
This is where the whole graph slides to the left or right and it only happens when you replace 'x' everywhere in th equation with 'x - a'.
Remember, if you want to go from y = f(x) to y = f(x - a) you must move the whole graph a distance 'a' in the +ve direction.
Therefore, if you want to go from y = f(x) to y = f(x + a) you must move the whole graph a distance 'a' in the -ve direction.
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