Question

Which relation is NOT a function?

a
{(0,0),(1,1),(2,0),(3,1)}
b
{(-3,4),(5,3),(1,1),(9,6)}
c
{(8,3),(2,10),(5,-4),(6,1)}
d
{(1,2),(7,4),(-2,9),(1,5)}

Answer 1

a is not a function

Explanation:

both 0,0 and 2,0 have the same y value