Question

which one of these is a function
x|-1|0|1|
y|0|0|2|

x|-1|0|1|
y|-2|0|2|

X|-1|0|0|
y|-2|0|2|

x|-1|0|1|
y|-1|0|1|

i cant figure this out they are all functions arent they ? i graphed them and did vertical line test

Answer 1

Are you paying attention that these are absolute values?

Answer 2

oops... how would you do it for number line?

Answer 3

Did you post the problem exactly as it is in the book?