Lesson 1-6/ 1-7Writing

Algebraic Expressions

To evaluate an expression, substitute a number for a variable

Example 1: Evaluate 3n + 7 when n = 3

Example 2: Evaluate n ÷ 2 + n when n = 4

(use PEMDAS)

Example 3: Evaluate 9 + 3p – 5t + 3 when p = 2 and t = 1

(use PEMDAS)

Example 4: Evaluate m² + y/5 when m = 2 and y = 35

(use PEMDAS)

How would you write this expression out in

words?

n + 25

Operation Key Words+ • Add

• More than• Sum

• Increased by

- • Subtract• Minus

• Difference of • Less than• Take away • Decreased by

x • Times• Multiplied by• Product of

÷ • Divided by• Quotient

Quotient

Sum

Less than

Product

More than

Difference

Increased by

Write each phrase as an algebraic expression

Example 5: 4 more than a number

Example 6: the product of 20 and t

Write each phrase as an algebraic expression

Example 7: the sum of 4 times a number and

2

Write each phrase as an algebraic expression

Example 8: 4 times the sum of a number and 2

Write each phrase as an algebraic expression

Example 9: m plus the product of 6 and n

Write each phrase as an algebraic expression

Example 10: 14 less than the quantity k times 6