Answer:
Explanation:
Look at the list of x-values in each case. If any are repeated, it is not a function.
{3, 3, 5, 4} -- not a function
{1, 3, 4, 6} -- is a function
{2, 4, 4, 5} -- not a function
{0, 3, 4, 6} -- is a function
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