Question

Which relation below is NOT a function?

A. {(-2, 4), (1,3), (0,4)}
B. {(5,5), (4,4), (3,3) }
C. {(-4,0), (-7,0), (11, 0)}
D. {(1,4), (2,5) (1,7)}

Answer 1

Functions have a unique value of y for each value of x.
D has two possible values of y when x = 1 therefore it is NOT a function