Page 3 - LN1

Finding the Value of an Expression: The value of an algebraic expression
depends on the value of the variables which forms the expression.

 There are many situations where we need to find the value of an expression,
such as when we want to check whether a particular value of a variable
satisfies a given equation or not.
 Example- To find the values of the expressions 3x – 7 for x = 5, we have to
replace x with 5, we get

3x – 7 = 3 x 5 – 7 = 15 – 7 = 8