### Theory:

So far, in algebra, we have learnt about coefficients, constants, variables and expressions.

Let us recall them.

What are variables?

Variables is a letter that is used to represent the value of an unknown number. That is, the value of the unknown number does not remain the same.
Example:
$$x$$, $$y$$, $$a$$, $$l$$, … etc are variables.
What are constants?

A constant is a number whose value does not change (remains the same).
Example:
$$2$$, $$1$$, $$5$$, $$71$$, … etc are constants.
What are coefficients?

A coefficient is a number which is generally multiplied with a variable.
Example:
$$3x$$ where $$3$$ is the coefficient of $$x$$.
What are algebraic expressions?

An algebraic expression is a group of variables, constants and coefficients which are separated by arithmetic operators (plus, minus, multiplication and division).
Example:
$$4x +3y +8$$, $$12x^2 - 3xy + 10$$ are algebraic expressions.
Framing algebraic expressions:

Let us learn how to frame an algebraic expression from the given statement.

Let us consider the examples.

 Operations Statement Algebraic expression Addition The sum of $$5$$ and $$y$$ $$5 + y$$ Subtraction The number $$8$$ is less than $$p$$ $$p - 8$$ Multiplication The number $$7$$ is subtracted from $$5$$ times $$x$$ $$5x - 7$$ Division The number $$10$$ divided by $$l$$ $$\frac{10}{l}$$