Use a comma to set off a -a phrase that is added after an inependent clause and is preceded by a comma.

substitute y = 2x - 4 to x + 2y = 12:

x + 2(2x - 4) = 12     use distributive property

x + (2)(2x) + () = 12

x + 4x - 8 = 12     add 8 to both sides

5x = 20     divide both sides by 5

x = 4

put the value of x to the first equation:

y = 2(4) - 4

y = 8 - 4

y = 4

a term is used to describe a sudden revelation in a short story is "showing forth".

i think continuous as the stars that shine and twinkle on the milky way, they

stretched in never-ending line along the margin of a bay; ten thousand saw

i at glance, tossing their heads in sprightly dance.