Answer:
5. C. {(22, 10), (23, 10), (24, 7), (25, 5)}
6. C. x = -2
Step-by-step explanation:
A relation is not a function if a vertical line intersects a graph of it in more than one place.
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5. A set of ordered pairs is not a function if any of the first-values is repeated.
In set A, (22, ) is repeated.
In set B, (23, ) is repeated.
In set D, (24, ) is repeated.
In set C, no first-value is repeated, so the relation is a function.
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6. The line x=-2 is a vertical line, so a vertical line intersect it in an infinite number of places. It is NOT a function.
