Let us study linear equations in two variables An excellent characteristic of equations in two variables is their adaptability to graphical analysis. The rectangular coordinate system is used in analyzing equations graphically. This system of horizontal and vertical lines, meeting each other at right angles and thus forming a rectangular grid, is often called the Cartesian coordinate system. It is named after the mathematician and French philosopher, Rene Descartes, who invented it.
A Linear equation is a first level algebraic expression with one, two or more variables equated to a constant. Graphically a linear equation with three variables represents a plane whereas. One or two variables is a straight line A simple linear equation is an equality between two algebraic expressions involving an unknown value called the variable. In a linear equation the exponent of the variable is always equal to 1.
The two sides of an equation are called Right Hand Side (RHS) and Left-Hand Side (LHS). They are written on either side of equal sign.
I hope the above explanation was useful.
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