SOLUTION: Is {{{x^2 + y^2 = 4}}} a function of x? I was gone the day my teacher taught this and I'm lost and confused, maybe you could explain it to me?

Algebra ->  Functions -> SOLUTION: Is {{{x^2 + y^2 = 4}}} a function of x? I was gone the day my teacher taught this and I'm lost and confused, maybe you could explain it to me?      Log On


   

Question 220340: Is x%5E2+%2B+y%5E2+=+4 a function of x?
I was gone the day my teacher taught this and I'm lost and confused, maybe you could explain it to me?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Simply graph x%5E2+%2B+y%5E2+=+4 (note: solve for 'y') to get




Since the graph does NOT pass the vertical line test, it is NOT a function.