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

y = -x

Question

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

anonymous · Answer

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

anonymous · Answer

@phi could you help me? please!

phi · Answer

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