If we have two sides equal each other, then we called the statement "equation"
Example: 
2x + 3 = 5x - 2 is called an equation
2x + 3 is an algebraic expression
5x - 2 is an algebraic expression
When we put = sign between them, they called an equation
Then when two equal signs are placed between two algebraic expressions, they formed an equation
The answer is an equation
 
        
             
        
        
        
12. 360-140=220  x+12=220  x=208
13. 360-8=352  x-47=352   x=399
14. 360-80=280  2x+10=280  x=135
15. 125-64=61  x=61
16. 167-88=79  x=79
 
        
             
        
        
        
Given:
Original price of a TV = $499
Price increased by 15%.
To find:
The new price of the TV.
Solution:
According to the question,
New price of the TV = Original price + 15% of its original price.



Therefore, the new price of the TV is $573.85.
 
        
             
        
        
        
A because they have a higher average
 
        
             
        
        
        
Answer:
see explanation
Step-by-step explanation:
(e)
 -
 -  = 1
 = 1
Multiply through by 12 to clear the fractions
4(2x - 1) - 3(3x - 1) = 12 ← distribute parenthesis and simplify
8x - 4 - 9x + 3 = 12
- x - 1 = 12 ( add 1 to both sides )
- x = 13 ( multiply both sides by - 1 )
x = - 13
---------------------------------------------------------------
(f)
 - 5 = 24 ( add 5 to both sides )
 - 5 = 24 ( add 5 to both sides )
 = 29 ( multiply both sides by 4 )
 = 29 ( multiply both sides by 4 )
3m = 116 ( divide both sides by 3 )
m = 
--------------------------------------------------------------
(g)
 -
 -  = 3
 = 3
Multiply through by 6 to clear the fractions
15(y + 2) - 8(y + 1) = 18 ← distribute parenthesis and simplify
15y + 30 - 8y - 8 = 18
7y + 22 = 18 ( subtract 22 from both sides )
7y = - 4 ( divide both sides by 7 )
y = - 