According to economists, this episode of great recession was resulted from a sudden busting of house bubble in US, where the house bubble was caused by rapid growth of improper regulation on sub-prime mortgages (Merriam 2009; Wang 2009; Whitney 2007).
When working with equations that have two variables, the coordinate plane is an important tool. It's a way to draw pictures of equations that makes them easier to understand. To create a coordinate plane, start with a sheet of graph or grid paper. Next, draw a horizontal line.
The Coordinate Plane. A coordinate plane is the rectangular plane formed with two number lines: one is vertical number line and the other one is the horizontal number line. In the horizontal number line, at left side, negative numbers are placed and at the right hand side, the positive numbers are placed.