Question

What values of x (if any) prove that the equation below is not a function?

y^2 + x^2 = 1

answer choices: Multiple, None, 0, 1, 2, 3

Provide explanations and/or computation.

Answer 1

2 and 3

Explanation:

for 0:y²=1,y=1

for 1:y²=0,y=0

for 2:y²=-3 r

for 3:y²=-8 and which is not a real number