State whether the given equation or function is linear. Write yes or no. Explain your reasoning.
5x^4 + 5y = 9
Yes, the equation is in linear form. It is in the form xy = C.

Yes, the equation is linear. 0

No, the equation is not linear. It is not in the form Ax + By = C.

No, the equation is not linear. It is in the form x + y = c.