The options that are not functions from those given are; Options B and C.
How to Identify Functions?
The vertical line test is a method that is used to determine given relation is a function or not.
A) This table can be classified as a function because the input x-values have independent y-values as output. The only repeated output value is 7. Thus, we can say that it is likely a quadratic function with x-intercept as x = 2.
B) This cannot be a function because the same input values which is 6 has 2 different output values.
C) Similar to B above, this curve cannot be a function because some input values have 2 output values which is not a property of a function.
D) This is a function because of the wave and it is likely a trigonometric function.
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