Substitute the Given Value Into an Expression

3x + 8   if x = 2

• 13

• 14

• 15

• 16

Evaluate the expression: x + 2 when x = 6

• 8

• 4

• 12

• 10

If a = 4 and b = 6, what is the value of 3a + 5b?

• 40

• 42

• 44

• 46

What is the first thing you do when evaluating an expression

• Substitute value in for the variable

• Combine like terms

• Parenthesis

Mathematical Equivalence

ON

Mathematical Equivalence

OFF

Evaluate expression if a=3 and b=4

• 2

• 1

• -8

• 8

Evaluate 2a + 4b 
if a = 10     and    b = 6

• 20

• 24

• 44

• 4

Evaluate n + 5² for n=3

• 13

• 8

• 25

• 28

What is substitution in math?

• Order in which you solve a math expression

• Breaking down a composite number until all of the factors are prime

• either a single number or variable, or numbers and variables multiplied together

• what happens when you take a value and put it in place of a variable