by: Apolinario "Sam" Ortega , founder of INVBAT.COM, Phoenix, AZ, USA

Answer

Why do I need to learn how to solve for determinant of 2 x 2 Matrix?
ANSWER
Learning how to compute for determinant of a 2 x 2 matrix is very important in solving two linear equations. Because of determinant it is now possible to solve two linear equations in few seconds. Click the link shown below for application of determinant.
2 Simultaneous Linear Equation Calculator