Question

Determine whether the formula describes y as a function of x. Explain your reasoning.

y = -x

Answer 1

This looks like a super easy problem, but maybe that's why I'm confused by it... help please!

Answer 2

@phi could you help me? please!

Answer 3

a function takes an input (the x in this case), and returns a unique y value

that is what you have.

You would not have a function if it returned two different values for the same x.
for example
\[ y = ±\sqrt{x} \]
would have two different values if we put in x=4. we would get back +2 and -2
that makes it NOT a function