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.
To graph linear equations in three variables, we need to use a 3D coordinate system like the one below. To make a 3D coordinate system, first draw a normal 2D coordinate plane like usual. Then add in a brand-spankin'-new z-axis through the originâonly it's popping out of the page in brilliant, stereoscopic 3D.