Question

Which of the following is NOT a function and why?

{ (-4, -4), (-3, -3), (0, 0), (3, -3), (4, -4) }


{ (-4, -2), (-1, -1), (1, 3) (1, 4), (7, 10) }

Answer 1

Answer: {(-4, -2), (-1, -1), (1, 3) (1, 4), (7, 10) }

Step-by-step explanation: The rule is that a function must only have one input to one output. In the function above, x=1 is used twice, therefore this is not a function.