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If f={(1,8),(2,8),(3,9)}, whose image is 9?

Answer and explanation

Correct answer: 3

The direct answer is A: 3. In an ordered pair (input, output), the first component is the input and the second component is its image. The given function contains (1,8), (2,8), and (3,9). To find whose image is 9, locate the pair whose second component is 9. That pair is (3,9), so f(3) = 9 and the required input is 3. Option A is correct. Option B, 1, is not correct because the pair with first component 1 is (1,8), so the image of 1 is 8. Option C, 2, is not correct because (2,8) shows that the image of 2 is also 8. Option D, 8, is not the required input; it is an output value, and the question asks whose image is 9. This illustrates that different inputs may have the same image: both 1 and 2 map to 8, while 3 maps to 9. Memory cue: in (x,y), x goes to y; to find the input for a known output, search the second coordinate and read the first.

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