# WRITE VARIABLE EXPRESSIONS

Write variable expressions :

A variable is a letter or symbol used to represent an unknown or unspecified number. The value of a variable may change.

The variables can take different values; they have no fixed value. But they are numbers. That is why as in the case of numbers, operations of addition, subtraction, multiplication and division can be done on them.

One important point must be noted regarding the expressions containing variables.

A number expression like (4 × 3) + 5 can be immediately evaluated as (4 × 3) + 5 = 12 + 5 = 17

But an expression like (4x + 5), which contains the variable x, cannot be evaluated. Only if x is given some value, an expression like (4x + 5) can be evaluated.

Let us see some example problems to understand how to write variable expressions.

Example 1 :

12 subtracted from z

Solution :

To form variable expression for the given statement we need to use the binary operator "-".

We need to subtract "12" from "z" Example 2 :

Solution :

To form variable expression for the given statement we need to use the binary operator "+".

We need to add "25" with "r"

Hence the variable expression for the given statement is "25 + r"

Example 3 :

p multiplied by 16

Solution :

To form variable expression for the given statement we need to use the binary operator "x".

We need to multiply p by 16

Hence the variable expression for the given statement is "16p"

Example 4 :

y multiplied by 10 and then 7 added to the product

Solution :

To form variable expression for the given statement we need to use the binary operators "x" and "+".

y multiplied by 10 = y x 10  =  10 y

7 added to the product  =  10 y + 7

Example 5 :

n multiplied by 2 and 1 subtracted from the product

Solution :

To form variable expression for the given statement we need to use the binary operators "x" and "-".

n multiplied by 2  =  n x 2  =  2 n

1 subtracted from the product  =  2 n - 1

Example 6 :

– p multiplied by 5

Solution :

To form variable expression for the given statement we need to use the binary operator "x".

– p multiplied by 5 = -p x 5  =  -5p

Example 7 :

Solution :

To form variable expression for the given statement we need to use the binary operator "+".

11 added to 2m = 2m + 11

Example 8 :

5 times y to which 3 is added

Solution :

To form variable expression for the given statement we need to use the binary operators "x" and "+".

5 times y = 5 y

to which 3 is added  = 5y + 3

Example 9 :

5 times y from which 3 is subtracted

Solution :

To form variable expression for the given statement we need to use the binary operators "x" and "-".

5 times y = 5 y

which 3 is subtracted  = 5y - 3

Example 10 :

y is multiplied by – 8 and then 5 is added to the result

Solution :

To form variable expression for the given statement we need to use the binary operators "x" and "+".

y is multiplied by – 8  =  -8 y

5 is added to the result = -8y + 5

After having gone through the stuff given above, we hope that the students would have understood "Write variable expressions".

Apart from the stuff given in this section, if you need any other stuff in math, please use our google custom search here. WORD PROBLEMS

HCF and LCM  word problems

Word problems on simple equations

Word problems on linear equations

Algebra word problems

Word problems on trains

Area and perimeter word problems

Word problems on direct variation and inverse variation

Word problems on unit price

Word problems on unit rate

Word problems on comparing rates

Converting customary units word problems

Converting metric units word problems

Word problems on simple interest

Word problems on compound interest

Word problems on types of angles

Complementary and supplementary angles word problems

Double facts word problems

Trigonometry word problems

Percentage word problems

Profit and loss word problems

Markup and markdown word problems

Decimal word problems

Word problems on fractions

Word problems on mixed fractrions

One step equation word problems

Linear inequalities word problems

Ratio and proportion word problems

Time and work word problems

Word problems on sets and venn diagrams

Word problems on ages

Pythagorean theorem word problems

Percent of a number word problems

Word problems on constant speed

Word problems on average speed

Word problems on sum of the angles of a triangle is 180 degree

OTHER TOPICS

Profit and loss shortcuts

Percentage shortcuts

Times table shortcuts

Time, speed and distance shortcuts

Ratio and proportion shortcuts

Domain and range of rational functions

Domain and range of rational functions with holes

Graphing rational functions

Graphing rational functions with holes

Converting repeating decimals in to fractions

Decimal representation of rational numbers

Finding square root using long division

L.C.M method to solve time and work problems

Translating the word problems in to algebraic expressions

Remainder when 2 power 256 is divided by 17

Remainder when 17 power 23 is divided by 16

Sum of all three digit numbers divisible by 6

Sum of all three digit numbers divisible by 7

Sum of all three digit numbers divisible by 8

Sum of all three digit numbers formed using 1, 3, 4

Sum of all three four digit numbers formed with non zero digits

Sum of all three four digit numbers formed using 0, 1, 2, 3

Sum of all three four digit numbers formed using 1, 2, 5, 6