Question

Which one of the following is not a function?
A. \(\left\{(x, y): x, y \in R, x^{2}=y\right\}\)
B. \(\left\{(x, y): x, y \in R, y^{2}=x\right\}\)
C. \(\left\{(x, y): x, y \in R, x=y^{3}\right\}\)
D. \(\left\{(x, y): x, y \in R, y=x^{3}\right\}\)

Answer 1

Option : (B)
A function is said to exist when we get a unique value for any value of \(\mathrm{x}\)..
Therefore,
Option \(B\) is correct.. \(y^{2}=x\) is not a function as for each value of \(x\), we will get 2 values of \(y . .\) which is not as per the definition of a function..

Answer 2

purchase tadalafil generic <a href="https://ordergnonline.com/">cialis 20mg usa</a> cheapest ed pills online