Simple Equations

An equation is a mathematical statement which states that the two expressions are equal. An equation is formed by placing an equal sign between two numerical or variable expressions, called the sides of the equation. At least one of the two sides must contain a variable. An equation remains the same if the expressions on LHS and on RHS are interchanged.

The words sum of, more than, added to, plus, increased by means addition. The words less than, decreased by, minus, difference, reduced by, subtract from means subtraction. The words multiply, multiplied by, twice, double, times means multiplication. The words divide, divided by, half of, one third of, the quotient of means division.

The value of the variable in the equation for which LHS = RHS is called the solution of the equation.

The balance of an equation is undisturbed if we add or subtract the same number on both sides of a balanced equation or if we multiply or divide by the same number on both sides of a balanced equation. Transposing means moving a term of an equation to the other side of equality with changing the sign of the term.

A value for the variable that makes an equation true is called the solution.The process of finding a solution is called solving the equation. Given the solution, we can form the equation.

Keywords: Variable, Inverse operation, Trial and error method

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