Question

Which equation does not represent a function? a) y = x + 5 b) y = x^2 + 3 c)y^2 = x + 4

Answer 1

`c)`

Explanation:

.

`y=x+5`

This is a function because for each value of `x` we have one value of `y`.

`y=x^2+3`

This is a function because for each value of `x` we have one value of `y`.

`y^2=x+4`

This is not a function because for each value of `x` we have more than one value of `y`. For example,

`x=5, :. y^2=5+4=9, :. y=sqrt9=+-3`