consider the dilation.
pre-image: a(−1, 3)a(−1, 3) , b(2, 1)b(2, 1) , and c(4, −3)c(4, −3)
image: a′(−2, 6)a′(−2, 6) , b′(4, 2)b′(4, 2) , and c′(8, −6)c′(8, −6)
is the dilation an expansion or contraction? what is the scale factor?

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0