How is there an element of contrast being used by the author? To restate: What opposite elements seem to be working against each other in this section?

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

answer: x = 4 and y = 4

Hi! your answer would be  the women's association.  here's why:   "the childrens toys" should be "the children's toys".  there's no apostrophe anywhere, and should go after "children". it does  not go after the 's' because children is already plural, and you usually only add an apostrophe after a plural noun ends with an s, like boys or girls, for example. that is the boys' toys."the women's association", is correct.  it's kinda like the one above.  "the childrens' toys", is not correct. reason why is explained in the first one.  "none of these" isn't correct, because "the women's association" is correct.  hoped i and if you have any more questions, ask me.  -dawn