July 18, 2015
GMAT Systems of equations will come into play when you have multiple variables and multiple equations. The general rule is that in order to solve for a linear equation with N variables you will need to have N different equations to solve for these variables. This rule is not hard and fast, but it is a good place to start.
When looking at linear equations, there is only going to be 1 solution for each variable. This is different in quadratic equations, which can have multiple solutions. A...