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1 2 Variables

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• 1. Variables Chapter 1.2 Pages 11-15
• 2. Warm Up Activity
• Sasha wanted to leave the waiter and 20% tip. The bill for the meal was \$23.50. How much did Sasha leave on the table?
• A triangle has two sides that are congruent (equal) in length.
• How many angles are congruent?
• Name the triangle.
• 3. First Grade Algebra
• + 6 = 16
• 5 + = 9
• - 5 = 5
• 8 - = 2
• 4. Fill in the missing box. The BOX was the variable.
• 5. What is the variable?
• x + 6 = 16
• 5 + t = 9
• n - 5 = 5
• 8 - r = 2
• 6. Fill in for the variable.
• John makes \$7.00 per hour (h) but chooses to pay a uniform cleaning fee of \$3.00 each day he works. How much does he make each day? …
• 7. \$7(h) - \$3 7(8) - 3 8 7(6) - 3 6 7(4) - 3 4 Day’s Pay Calculation Number of hours
• 8. \$7(h) - \$3 \$55 7(8) - 3 8 \$39 7(6) - 3 6 \$25 7(4) - 3 4 Day’s Pay Calculation Number of hours
• 9. Write an expression
• Nancee pays \$1.50 to ride the bus each way. She makes \$20 each night she sits for her young cousin. How much does she make? Sometimes she gets a ride home for free from her brother.
• 10. Let (r) be the number of rides she needs.
• r * \$1.50 = \$3.00
• r * \$1.50 = \$1.50
• Subtract bus fare from the total earned…
• 11. \$20 - 1.5r
• The order of operations states, do the multiplication first, then subtract.
• 12. Solve for x. Guess and test.
• 4x + 3 = 47
• 7x – 12 = 44
• 13. These work
• 4(11) + 3 = 47
• 7(8) – 12 = 44
• 14. Pens cost \$.30 Pencils cost \$.20
• How much for 10 pencils?
• How much for 2 pens and 4 pencils?
• 15. Total Bill
• 10 (.20) = \$2
• 2(.30) + 4 (.20) =
• (.60) + (.80) =
• \$1.40
• 16. Your Assignment
• Page 16 – 17
• # 11-37, and 45 odds