General maths help ( functions) (1 Viewer)

[Mdzabakly]

Explain why x^2+y^2 =4 is not a function

 

[theind1996]

Explain why x^2+y^2 =4 is not a function

Vertical line test. It's a circle, and the vertical line cuts the circle twice.

 

[Mdzabakly]

omg =-= i swear i cant belive i fail so much ... i totaly forgot that stuff =-=

 

[RivalryofTroll]

1. It does not satisfy the vertical line test.
2. For it to be a function, there can only be ONE y-value for every x-value.