A granola company sells two types of granola bars. A box of Mixed Bars is $3.50 more than a box of Original Bars. Ellie bought 3 boxes of Mixed Bars and 6 boxes of Original Bars for a total of $45.50. How much did each box of Original Bars cost? The model below represents the scenario.

Which equation represents this scenario?

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.