Question 1095846
<font color="black" face="times" size="3"><font color=red>The answer is the third choice</font>, which is <font color=red>(10,1)</font>. The reason why is because (10,-2) is a point in the given function set. We cannot list x = 10 more than once.


In visual terms, the relation would fail the vertical line test if the relation had (10,-2) and (10,1) at the same time in the set. The other points mentioned (choice 1, choice 2, choice 4) are allowed because those x values haven't been mentioned yet.
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