Using Variables ALGEBRA 1 LESSON 1-1 Write the operation (+, –, , ÷) that corresponds to each phrase. 1. divided by 2. difference 3. more than 4. product 5. minus 6. sum 7. multiplied by 8. quotient Find each amount. 9. 12 more than 9 10. 8 less than 13 11. 16 divided by 4 12. twice 25 1-1

Using Variables Solutions 1. divided by: ÷ 2. difference: – ALGEBRA 1 LESSON 1-1 Solutions 1. divided by: ÷ 2. difference: – 3. more than: + 4. product:  5. minus: – 6. sum: + 7. multiplied by:  8. quotient: ÷ 9. 12 more than 9: 9 + 12 = 21 10. 8 less than 13: 13 – 8 = 5 11. 16 divided by 4: 16 ÷ 4 = 4 12. twice 25: 2(25) = 50 1-1

Using Variables ALGEBRA 1 LESSON 1-1 Write an algebraic expression for “the sum of n and 8.” “Sum” indicates addition. Add the first number, n, and the second number, 8. n + 8 1-1

Using Variables ALGEBRA 1 LESSON 1-1 Define a variable and write an algebraic expression for “ten more than twice a number.” Relate: ten more than twice a number Define: Let y = the number. Write: 2 • y + 10 2y + 10 1-1

Using Variables Write an algebraic expression for each phrase. ALGEBRA 1 LESSON 1-1 Write an algebraic expression for each phrase. 1. 7 less than 9 2. the product of 8 and p 3. 4 more than twice c . . . 9 – 7 8p 2c + 4 1-1