(c) Prove that the equation of the bisectors of the angles between 12x - 5y + 7 = 0 and
4x - 3y + 8 = 0 are at right angles.​

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.