What is the slope , m , and y- intercept for the line that is plotted on the grid below

Use the graph of the sine function y=2sinθ shown below

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.

In a column proof the right column states your reasons