Understand signs of numbers in ordered pairs as indicating locations in quadrants of the coordinate plane; recognize that when two ordered pairs differ only by signs, the locations of the points are related by reflections across one or both axes.
Big Idea:Which stock price had the largest change? How do you know? What is the distance between (a, 5) and (a, -3)? Students continue tracking their investments and work on strategies for calculating length of horizontal and vertical lines.