Question

Rewrite y + 3 = 0 using function notation.

Answer 1

Answer:

B) $\displaystyle f(x) = -3$

Step-by-step explanation:

$\displaystyle y ← f(x) \\ \\ y + 3 = 0; y = -3 \\ \\ f(x) = -3$

Answer 2

F(x) basically just substitutes the "y"
so you would bring everything over to one side
y + 3 = 0
subtract 3
y = -3
then 
f(x) = -3

That is B)