= Solving a word problem with two unknowns using a linear... A washer and a dryer cost $650 combined. The washer costs $100 less than the dryer. What is the cost of the dryer?​

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.