Simplifying and Evaluating Variable Expressions

Simplify the expression: 2x + 1 + 7x 

• 10x
• 10
• 9x + 1
• 9 + 1x

Terms that have the same variables such as 5x and -8x.

• like terms

• coefficients

• exponents

• variables

Simplify by combining like terms:
5a + 2b - 3a + 4

• 8a + 2b + 4
• 2a + 2b + 4
• 8ab
• 4ab + 4

Combine like terms
3x + 2x + 3y - 7y

• 5x + 10y
• 5x + 4y
• 5x - 4y
• 5x -10y

Which of these are like terms in the following expression:
3x + 7 - 9x + 24y + 2x²

• 7, 24y
• 3x, 9x
• 3x, -9x
• 3x, -9x, 2x²

What is the value of x + y if x = 3 and y = 5?

• 8
• 5
• 3
• 2

Evaluate the expression.   Let g = 3    h = 9 
4h + 2g + 4

• 42
• 46
• 34
• 58

r(r – 9)
r = 11

• 12
• 22
• 44
• 99

2q + 3
q = 5 

• 11
• 15
• 17
• 13