According to the author, if "instruction is tightly controlled by the teacher," then

the answer is c, because they are being narrated.

you have to write the essay, it counts as cheating if i do. so just use your brain; you're a smart kid. you can do it. : )

explanation:

nah. i'm good.

im not to sure

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