Ineed on all these 10 me so i can get them right i really need it

Can someone answer it, and plot it, for 20 points and brainliest answer? p.s. they're the same ! : )

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}