Question

Which equation does not represent a function?

A y= 4
C y = x – 4
B y = x2 - 4
B
D x2 + y2 = 4

Answer 1

D x2 + y2 = 4

Explanation:

The following are the functions

y = 4

y = x - 4

y = x^2 - 4

but

x^2 + y^2 = 4 is not a function as there should be minimum one x value with two or more y values

But the above equation does not meet the criteria so this represent non-function