I think this attachment will help you
Which is the right answer?
2 answers:
Answer is (-2,1) the second choice
Reason
Remember, a function can only assign an input value to one output value. If you see the same x-value with more than one y-value, it’s not a function
There are two -2 x values (-2,1) and (-2,-3) so one has to go
The choices say to eliminate ( -2, 1)
There is also a vertical line test, if a vertical line goes over a point more than once, it is not a function.
See attachment.
Reason
Remember, a function can only assign an input value to one output value. If you see the same x-value with more than one y-value, it’s not a function
There are two -2 x values (-2,1) and (-2,-3) so one has to go
The choices say to eliminate ( -2, 1)
There is also a vertical line test, if a vertical line goes over a point more than once, it is not a function.
See attachment.
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