Applications of Algebraic Expressions

We will discuss about the applications of algebraic expressions in everyday life. 

The most important use of algebraic expression is to solve a word problem by translating the word statement to that statement in the symbols of algebra. Writing an algebraic expression which represents a particular situation is called an algebraic representation.

Algebraic representations of some practical situations are as follows:

Situations

Variables

Statements using Algebraic Expressions

(Algebraic Representations)

1. James has 10 more balls than Robert.

     Let the no. of balls of Robert has be x.

James has (x + 10) balls.

2. Richard is twice as old as Linda.

3. The age of the father of Alexander is 2 years more than 3 times the Alexander 's age.

     Let Linda's age be x years.

  Let Alexander's age be x years.

Richard's age is 2x years.

The age of the father of Alexander is (3x + 2) years.

4. Price of apple per kg is $ 2 less than price of orange per kg.

     Let the price of orange per kg be $p.

Price of apple per kg is $(p - 2).

5. How old will Rebecca be 5 years from now?

     Let y be Rebecca's present age in years.

Five years from now, Rebecca will be (y + 5) years old.


A mathematical sentence with an equality sign is called statement of equality.

For example: x + 5 = 9

Statements of equality involving one or more variables is called an equation.

or

An equation is an equality between two algebraic expressions/statements.

The sign of equality in an equation divides it into two sides, namely left hand side (L.H.S) and right hand side (R.H.S). L.H.S and R.H.S of an equation are like the two scales of a balance.

For example: 

(i)

  x + 2

(L.H.S)

=

     3

(R.H.S)

(ii)

 y + 2

(L.H.S)

=

    9

(R.H.S)


Working Rules for Make an Algebraic Expression:


Step I: Take any variables, say x.

Step II: Perform any of the four operations i.e., add, subtract, divide or multiply on that variable x to make an algebraic expression.

Step III: Make the algebraic expression a statement of equality.

Step IV: The result will involve a variable with a statement of equality which is called an equation.


Solved Examples on Applications of Algebraic Expressions:

1. Write an algebraic expression 6 less than one-fourth of'x'.

Solution:

One-fourth of x = \(\frac{1}{4}\) x = \(\frac{x}{4}\)

6 less than one-fourth x = \(\frac{x}{4}\) - 6 which is the required equation.


2. Write an equation for each of the following statements:

(i) The difference between x and the sum of 2 and 3 is 11.

(ii) The sum of \(\frac{4}{5}\)th of x and five times x is 140.

Solution:

(i) The sum of 2 and 3 = 2 + 3.

Now, the difference between x and the sum of 2 and 3 is 11, is given by

x - (2 + 3) = 11

or, x - 5 = 11 which is the required equation.


(ii) \(\frac{4}{5}\) th of x = \(\frac{4x}{5}\) and five times x = 5x

Now, the he sum of \(\frac{4}{5}\)th of x and five times x is 140, , is given by

\(\frac{4x}{5}\) + 5x = 140, which is the required equation


Algebra Page

6th Grade Page

From Applications of Algebraic Expressions to HOME PAGE



Didn't find what you were looking for? Or want to know more information about Math Only Math. Use this Google Search to find what you need.



New! Comments

Have your say about what you just read! Leave me a comment in the box below. Ask a Question or Answer a Question.




Share this page: What’s this?

Recent Articles

  1. Worksheet on Money | Conversion of Money from Rupees to Paisa

    Dec 03, 24 01:29 AM

    Worksheet on Money
    Practice the questions given in the worksheet on money. This sheet provides different types of questions where students need to express the amount of money in short form and long form

    Read More

  2. 2nd Grade Money Worksheet | Conversion of Money | Word Problems

    Dec 03, 24 01:19 AM

    Match the following Money
    In 2nd grade money worksheet we will solve the problems on writing amount in words and figures, conversion of money and word problems on money. 1. Write T for true and F for false. (i) Rs. is written…

    Read More

  3. Subtraction of Money | Subtraction with Conversion, without Conversion

    Dec 02, 24 01:47 PM

    Subtraction of Money
    In subtraction of money we will learn how to subtract the amounts of money involving rupees and paise to find the difference. We carryout subtraction with money the same way as in decimal numbers. Whi…

    Read More

  4. Word Problems on Addition of Money |Money Word Problems|Money Addition

    Dec 02, 24 01:26 PM

    Word Problems on Addition of Money
    Let us consider some of the word problems on addition of money. We have solved the problems in both the methods i.e., with conversion into paise and without conversion into paise. Worked-out examples

    Read More

  5. Addition of Money | Add The Amounts of Money Involving Rupees & Paisa

    Nov 29, 24 01:26 AM

    3rd Grade Addition of Money
    In addition of money we will learn how to add the amounts of money involving rupees and paisa together. We carryout with money the same way as in decimal numbers. While adding we need to follow that t…

    Read More