I am stuck on these 2 questions, please help

The limit represents / '(c) for a function /(x) and a number c. Find /(x) and c. 7 vx - 21 lim x-+ 9 x - 9 ((X) = X CE XFind an equation of a line that is tangent to the graph of fend parallel to the given line. Function Line f{x)=x3 3xy+g=u if = X (larger yintercept) V = :| X (smaller y-intercept)