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kayser
Which of the following represents a relation that is NOT a function? A. X -8 -4 6 11 Y 26 24 32 26 B. X 6 -4 11 -8 Y 26 24 32 26 C. X -8 -4 -8 4 Y 26 24 32 26 D. X -8 -4 -2 4 Y 26 24 32 26
It's actually choice C -8 maps to both 26 and 32 at the same time
Something is a function if you can always answer the question "For a given X, what's the value of Y"? (1, 2) (3, 2) --> What's the value if x=1? It's 2. What's the value if x=3? It's 2. Since you can always answer the question, it's a function. (1, 8) (1, 9) --> What's the value if x=1? You don't know. it could be either 8 or 9. Therefore it's not a function.