Math CentralQuandaries & Queries


Question from a parent:

Refer to the graph given below and identify the graph that represents the corresponding function. Justify your answer.
y = 2x
y = log2x
I can figure out what line on the graph is which equation but unsure what is meant by justify your answer.


How did you identify which graph is which? If you can explain your reasoning then that might be sufficient justification. One observation is that when x = 0 the first function gives y = 0 and the other gives no y-value since log(0) is not defined.


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