I'm having trouble with Ax=b matrices. I get really confused when dealing with matrices that have a different number of rows from columns. An example is this problem: (A is a 3x2 matrix) A = 3 1 4 2 -5 -1 (b is a 3x1 matrix) b = 1 0 -3 I need to find the solution set for x. Aren't there only 2 variables? Thanks.