In the given function y = 9x - 9, the initial value refers to the value of y when x is equal to 0.
To find the initial value, we substitute x = 0 into the equation and solve for y:
y = 9(0) - 9
y = 0 - 9
y = -9
Therefore, the initial value of the function y = 9x - 9 is -9.
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