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Formulae and Their Uses

Summary

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Formula

A formula consists of constants and variables.

In a formula the variables are interrelated. A formula is an equation that establishes a relationship among the variables involved in it. The plural form of formula is formulae.

Framing a formula:

Expressing a given statement in the form of an equation by using variables and mathematical symbols is called framing a formula.

Subject of a formula:

The subject of a formula is a variable that is expressed in terms of the other variables.

In other words, in a formula, the variable standing alone on one side of the equality sign is called the subject of the formula. The subject of a formula always lies on left hand side of the equality sign. The coefficient of the subject is always one. The subject of a formula does not link with any other quantities.

Changing the subject of a formula:

Any one variable of a formula can be made the subject by transferring the variables.

Evaluation of the subject of a formula (substitution method):

Finding the value of the subject by substituting the values of the other variables is called the evaluation of the subject of a formula.

Steps to evaluate the subject of a formula:

• Make the required variable the subject.

• Substitute the values of the other variables in the formula.

• Simplify the formula.