Thanks for the help everybody

thanks battlejoe i understand how now. I also want to say sorry to the people that i argued with in the tutoring section today and thanks for the clarification everybody. i think i am going to do well on this test because of you guys. another question though, on 23 in the review chapter 3, i forgot how you plug in the x and y value. i tried my way and it turned out like a straight line. can someone help me? thanks a whole lot!!! melissa