What is X and please explain your answer?

Given the graph below state whether or not the relation is a function, and give the domain and range.

An equation where variables are used to represent known values—function notation true or false

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.