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 x and y variables of a system of linear equations match up with the x- and y-axes on a graph. There are two variables for two dimensions. When we add in a third variable, z, that means we travel into The Third Dimension. Wooooaoooo. Linear equations in two dimensions are represented on a graph as lines.