Chapter 1 - Introduction to Algebraic Expressions - Review Exercises: Chapter 1 - Page 77: 67

A constant has a fixed value, which is represented by a real number from the real number line. For example $1$, $0$, $-5$, $2$ etc. While a variable has no fixed value. That is why it is represented by an alphabet or by a symbol. For example $x$, $a$, $\alpha$, and $M$ etc.

A constant has a fixed value, which is represented by a real number from the real number line. For example $1$, $0$, $-5$, $2$ etc. While a variable has no fixed value. That is why it is represented by an alphabet or by a symbol. For example $x$, $a$, $\alpha$, and $M$ etc.