Simplifying Expressions

Variable terms are called "variable" because:

• they are pretty.
• they never change.
• they vary (change).
• they don't have letters.

What are coefficients?

• The letters in an expression
• The numbers without a letter
• The same as constants
• The number before a letter 

What are constants in an expression?

• The number before a letter

• The numbers without any letters.

• The + and - signs

• The letters

4a + 9 + a

• 5a + 9
• 14a
• 3a + 9
• 5a - 9

10 - 7 + 8x - 5x

• 3x + 17

• 3x + 3

• 13x +3

• 13x +17

Answer explanation

Make sure you look at the sign in front of the number!

Simplify:
10y - 7y + 8y - 7y

• 4y
• 4x
• -4x
• -4y

Simplify the Expression. 
9z  - 21 - 3z + 10

• Simplified
• 9z - 21 - 7
• 9z - 11 -3z
• 6z - 11

Simplify   6(x + -2)

• 6x + -2
• 6x - 12
• 4x
• 6x - 2

Simplify    5(2 - 7n)

•  52 - 57n
• 10 - 7n
• 10 - 35n
• 10 + 35n

What is the simplified version of this expression? $-4(8r+3)$  

•  $-32r-12$  

•  $32r-12$  

•  $-32r+12$  

•  $32r+12$