There is a thousand answer to this problem.
Let's do the simplest one here.
f(x) or y = x - 1
f(x) or y = x + 1
f(x) or y = -x
Wait, would this count as a solution? : See the second attachment
Answer: B
Step-by-step explanation:
The line is curved which makes it a non-linear function.
Rhombus or diamond I think. I hope that this helps!