Question

Which of the following best describes the graph below?

Answer 1

I believe its not a function

Answer 2

Answer:

D. It is not a function.

Step-by-step explanation:

Radius of given circle = 4 units

Center = (0,0)

Equation of circle : $(x-h)^2+(y-k)^2 =r^2$

where (h,k) is the center

So, equation of given circle = $x^2+y^2 =4^2$

Substitute x = -1

$(-1)^2+y^2 =4^2$

$1+y^2 =16$

$y=\sqrt{15}$

$y=\pm 3.872$

So, since at one value of x we are getting the two values of y .

A function is a relation that for each input, there is only one output.

So, It is not a function.

Hence Option D is true.