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 Sub Topics There are certain rules or principles that can be true. In numbers, basically three houses of numbers we use for example commutative, associative and also distributive. The below properties hold for being true for inclusion and multiplication for all the numbers.Commutative property: Changing the order with the addends/factors does not really change the result.  For Example: a + b = b + a or ab = baZero Property: The product of zero and also a number is actually zero number. For Example: b * 0 = 0 * b = 0.Identity property: The sum/product of zero/one and a number is that variety. a + 0 = 0 + a = a or 1 * a = a * 1 = a.

## Inequality

Inequality tells us about the relative size of two values. In general there are four kinds of inequalities.

 Symbol Words Example > Greater than x + 9 > 15 < Less than 5x < 95 $\geq$ Greater than or equal to 4 $\geq$ x - 7 $\leq$ Less than or equal to 8y + 1 $\leq$ 9

Equalities will be the expressions with equal (=) sign. While inequalities will be the expressions which have inequality (<, >, $\geq$, $\leq$) signs included.

Consider a, b and c to be real numbers, after that

Adding c to both sides of inequality just shifts everything along, as well as the inequality stays the same.
Also If a > b, a + c > b + c and
If a < b, a - c < b - c

If we multiply a number with minus sign, it changes the direction of the inequality. (additive inverse)
And in multiplicative inverse,  direction of the inequality is changed by taking the reciprocal of given numbers

If a < b then -a > -b

If a > b then -a < -b

If a < b then $\frac{1}{a}$$\frac{1}{b}$

If a > b then $\frac{1}{a}$ < $\frac{1}{b}$

Multiplication Inequality Property:

When we increase in numbers both a and b by the positive number, the inequality stays the same.
But when we all multiply both a and b by the negative number, your inequality swaps above!

If a < b, and c > 0, after that ac < bc

If a > b, and c > 0, after that ac > bc

If a < b, and c < 0, after that ac > bc

If a > b, and c < 0, after that ac < bc

Consider a situation below for any better understanding.

Alex's score of 3 is lower than Billy's score of 7.

$\rightarrow$ a < b

If both Alex and Billy find a way to double their standing (×2), Alex's score it's still lower than Billy's score.

$\rightarrow$ 2a < 2b

But when multiplying by the negative the reverse happens: But if your scores become minuses, then Alex seems to lose 3 points and Billy loses 7 points.

So Alex has now done better when compared with Billy!

-a > -b.

## Equality

Equality is surely an expression having equivalent symbol. Addition of equality is one of the basic properties associated with equality. In mathematics, multiplication is one of the important and fundamental arithmetic operations.

Commutative property associated with addition: The addition property of equality says that when we add identical value or amount on both sides of the equation, the values on the two sides remain equivalent. For example 5 + 6 = 6 + 5 = 11.

Commutative Property associated with Multiplication: For multiplication, this rule is "ab = ba"; in numbers, this implies 2×3 = 3×2 = 6.

Zero Property associated with Multiplication: The product of zero and also a number is actually zero. b * 0 = 0* b = 0

Identity property of Addition: The sum of zero and a number is the number itself. a + 0 = 0 + a = a

Identity property associated with Multiplication: The product of a single and a variety is that variety. 1 * a = a * 1 = a.

## Examples

Few examples are sorted below.

Example 1: Solve x - 4 = - 9

Solution: We can get rid of the 4 from the particular left side with the equation by adding 4 to each side with the equation: x - 4 + 4 = - 9 + 4 (Add 4 to help each side. )x + 0 = -5 (Simplify every side.)x = -5

Therefore -5 is the solution set for the equation

Multiplication Property involving Equality : To isolate a variable that may be involved in a product or a quotient, we'd like the multiplication property of equality.

Multiplying both sides of the equation by identical non zero number does not change the solution for the equation. Symbolically, if a = b and c $\neq$ 0, subsequently ac = bc

Example 2: Solve $\frac{m}{3}$ = 8

Solution: Multiplying both sides by the same number.

We separate the variable m by multiplying each side with the equation by 3.

Given the main equation is

$\frac{m }{3}$ = 8

Multiply both sides by 3.
$\frac{m }{3}$ = 8.

m = 24

Consequently, 24 is the solution for the equation.

Example 3: Find the solution set for 2x + 10 < 8.

Solution: Given
2x + 10 < 8

To isolate x, first subtract 10 each side

2x + 10 - 10 < 8 - 10

2x < -2

Divide both sides by 2

$\frac{2x}{2}$ >
$\frac{-2}{2}$

x > -1

Therefore the solution set for x is all real numbers greater than -1.