Determine if the equation x2 – y = 1 defines y as a function of x.

Question

A   Yes. One output results in one input.

B   No. At least one output results in two inputs.

C   Yes. One input results in one output.

D   No. At least one input results in two outputs.

Answer 1

I assume you meant to say

 

x² - y = 1

 

Then

 

y = x² - 1

 

This is a function because each value of x results in only one value of y.