The value of k translates the graph vertically (upwards or downwards)
The given equation is:
y = ab(x - h) + k
Let the equation before k was added be y₀
That is, y₀ = ab(x - h)
The equation can therefore be written as:
y = y₀ + k
The value of k is a vertical translation of y₀. It can either be shifted up or down depending on whether the value of k is positive or negative.
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