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# 1 2 Variables

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### 1 2 Variables

1. 1. Variables Chapter 1.2 Pages 11-15
2. 2. Warm Up Activity <ul><li>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? </li></ul><ul><li>A triangle has two sides that are congruent (equal) in length. </li></ul><ul><ul><li>How many angles are congruent? </li></ul></ul><ul><ul><li>Name the triangle. </li></ul></ul>
3. 3. First Grade Algebra <ul><li>+ 6 = 16 </li></ul><ul><li>5 + = 9 </li></ul><ul><li>- 5 = 5 </li></ul><ul><li>8 - = 2 </li></ul>
4. 4. Fill in the missing box. The BOX was the variable.
5. 5. What is the variable? <ul><li>x + 6 = 16 </li></ul><ul><li>5 + t = 9 </li></ul><ul><li>n - 5 = 5 </li></ul><ul><li>8 - r = 2 </li></ul>
6. 6. Fill in for the variable. <ul><li>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? … </li></ul>
7. 7. \$7(h) - \$3 7(8) - 3 8 7(6) - 3 6 7(4) - 3 4 Day’s Pay Calculation Number of hours
8. 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. 9. Write an expression <ul><li>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. </li></ul>
10. 10. Let (r) be the number of rides she needs. <ul><li>r * \$1.50 = \$3.00 </li></ul><ul><li>r * \$1.50 = \$1.50 </li></ul><ul><li>Subtract bus fare from the total earned… </li></ul>
11. 11. \$20 - 1.5r <ul><li>The order of operations states, do the multiplication first, then subtract. </li></ul>
12. 12. Solve for x. Guess and test. <ul><li>4x + 3 = 47 </li></ul><ul><li>7x – 12 = 44 </li></ul>
13. 13. These work <ul><li>4(11) + 3 = 47 </li></ul><ul><li>7(8) – 12 = 44 </li></ul>
14. 14. Pens cost \$.30 Pencils cost \$.20 <ul><li>How much for 10 pencils? </li></ul><ul><li>How much for 2 pens and 4 pencils? </li></ul>
15. 15. Total Bill <ul><li>10 (.20) = \$2 </li></ul><ul><li>2(.30) + 4 (.20) = </li></ul><ul><li>(.60) + (.80) = </li></ul><ul><li>\$1.40 </li></ul>
16. 16. Your Assignment <ul><ul><li>Page 16 – 17 </li></ul></ul><ul><ul><li># 11-37, and 45 odds </li></ul></ul>