Question

Which of the following are not a function?
a. {(1,1), (1,2), 1,3)}
b. {(1,1), (2,1), (3,1)}
c. {(1,4), (3,8), (5,16)}
d. {(1,1), (2,2), (3,3)}

Answer 1

hint: if you have repeating x values, then it's NOT a function

Answer 2

each x input needs to have EXACTLY ONE y output for it to be a function

Answer 3

The first one isn't a function?

Answer 4

yes because of those repeating x values of 1

Answer 5

if x = 1, is y equal to 1? equal to 2? or 3? which one?

this confusion what y is equal to means we don't have a function

Answer 6

Thank you so much

Answer 7

np