Evaluate Expressions

What is the first thing you do when evaluating an expression

• Substitute value in for the variable

• Combine like terms

• Parenthesis

Evaluate 4y  if       y = 3

• 7
• 12

Evaluate -2x  if     x = 10

• -8
• 20
• -20

Evaluate 7 + j if     j = -2

• -14
• 14
• 5
• 9

If x = 3 evaluate x + 4 =

• 5

• 6

• 7

• 8

Evaluate 2r + 1      if   r = 3

• 6
• 5
• 7
• 8

3x + 8   if x = 2

• 13
• 14
• 15
• 16

Evaluate 7y - 3y for y=2

• 40
• 73
• 8
• 4