I am slightly confused. What exactly is the question?
Answer:
1
Step-by-step explanation:
This is the answer by definition.
The first step to solving this equation is to change the signs on both sides of the equation
y = -

x + 3
Since we don't know what x is but we do know why y is,, we will write our answer with the answer to y and x being left as undefined.
y = -

x + 3, x ∈ R
Let me know if you have any further questions
:)