Use substitution to solve the system of equations. y = −2x x − 3y = 21 (3, 4) (−6, 12) (3, −6) (−2, −6)

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

What percent of the circle below is shaded?

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.