If you heard the phrase "Do not count your chickens before they hatch," you would most likely find it in a A. Myth
B. Legend
C. Fable
D. Fiction story

C

Explanation:

Honestly could be D, but that's really rare since Fiction is mainly about non realistic events while a fable mainly on the topic of animals. So its more reliable that saying would be in a fable

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