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What is variable in maths and also define linear equations with eg.

Posted by Tanisha Dahiya 4 years ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 4 years ago

Variable

In Maths, a variable is an alphabet or term that represents an unknown number. The variables are specially used in the case of algebraic expression or algebra. The variable is a quantity that can be changed or which is not fixed according to the mathematical operation performed. Usually, in algebra, we express an unknown number using the term ‘x’ and ‘y’. But this is not particular, and we can use any alphabet.

Linear Equations

An equation is said to be linear equation in two variables if it is written in the form of ax + by + c=0, where a, b & c are real numbers and the coefficients of x and y, i.e a and b respectively, are not equal to zero.

For example, 10x+4y = 3 and -x+5y = 2 are linear equations in two variables.

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