Answer:
y-axis
Explanation:
You want the axis that is an asymptote to the function y = log₃(x).
Log function
The value of a log function tends to -∞ when its argument approaches zero. That means the y-axis is an asymptote.
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Additional comment
There are only two axes involved in a graph of y = log₃(x). If the x-axis is not an asymptote, then the only remaining axis must be. That would be the y-axis.
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