Using Variables ALGEBRA 1 LESSON 1-1

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Presentation transcript:

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 equation to show the total income from selling tickets to a school play for $5 each. Relate: The total income is 5 times the number of tickets sold. Define: Let t = the number of tickets sold. Let i = the total income Write: i = 5 • t i = 5t 1-1

Using Variables Write an equation for the data in the table. Gallons ALGEBRA 1 LESSON 1-1 Write an equation for the data in the table. Gallons Miles 4 6 8 10 80 120 160 200 Relate: Miles traveled equals 20 times the number of gallons. Define: Let m = the number of miles traveled. Let g = the number of gallons. Write: m = 20 • g m = 20g 1-1

Writing Equations ALGEBRA 1 LESSON 1-1 . Define variables and write an equation to model each situation. 1. The total cost is the number of sandwiches times $3.50. 2. The perimeter of a regular hexagon is 6 times the length of one side. Let c = the total cost and s = the number of sandwiches; c = 3.5s Let p = the perimeter and s = the length of a side; p = 6s 1-1