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If (f:{1,2,3,4}\to{1,2,3,4}) and (f(x)=5-x), which are the ordered pairs of (f)?

Answer and explanation

Correct answer: ({(1,4),(2,3),(3,2),(4,1)})

The direct answer is A: {(1,4),(2,3),(3,2),(4,1)}. A function is represented by ordered pairs (x,f(x)). Use each domain value in turn and calculate f(x)=5−x. For x=1, f(1)=5−1=4, giving (1,4). For x=2, f(2)=3, giving (2,3). For x=3, f(3)=2, giving (3,2). For x=4, f(4)=1, giving (4,1). Therefore option A is exactly the graph of the function. Option B represents the identity function f(x)=x, not the given rule. Option C incorrectly gives output 5 for every input; that would be a constant function. Option D gives outputs 3,4,1,2, which do not follow 5−x. All outputs are in the stated codomain {1,2,3,4}. Exam cue: substitute every domain element carefully, then write pairs as (input, output), never (output, input).

Related tags

Relations-FunctionsOrdered-PairsFunction-Rule

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