APFIVE Definition Of A Function
Which of the following is an example of a function that maps each input value to exactly one output value?
A
The rule $$f(x)=2*x+3$$, which assigns exactly one output for every input.
B
The relation $$\{ (1,2), (1,3), (2,5) \}$$, where one input maps to multiple outputs.
C
The circle described by $$x^2+y^2=16$$, which fails the vertical line test.
D
The relation $$\{ (1,2), (2,3), (2,4), (3,5) \}$$, where an input appears with more than one output.
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