Question

which of the following tables does not represent a function

x 9,4,2,5,6,4,
y 7,4,9,2,5,4,

x 1,2,-5,5,1,7,
y 7,5,9,2,5,4,

x 1,3,7,5,2,4,
y 4,4,4,4,4,4,

x 4,12,16,5,6,2,
y 6, 4,3,3, 5,1,

Answer 1

The second table does not represent a function because there are repeated values of x which correspond to different values of y. For x=1, y can be either 7 or 5. This violates the definition of a function where each input value (x) must correspond to exactly one output value (y).