1. Holt CA Course 1 Solving Equations by Dividing 1-10 AF1.1 Write and solve one-step linear equations in one variable. California Standards

2. Holt CA Course 1 Solving Equations by Dividing 1-10 VOCABULARY CARDS

3. Holt CA Course 1 Solving Equations by Dividing 1-10 5p = 75p is multiplied by 5. 5 p = 15 Divide both sides by 5 to undo the multiplication. Check 5p = 75 Substitute 15 for p in the equation. Solve the equation. Check your answer. 15 is the solution. 75 = 75 ? Teacher Example 1: Solving Equations by Dividing 5(15)= 75 ? 5 5p = 75

4. Holt CA Course 1 Solving Equations by Dividing 1-10 8a = 72 a is multiplied by 8. 8 a = 9 Divide both sides by 8 to undo the multiplication. Check 8a = 72 Substitute 9 for a in the equation. Solve the equation. Check your answer. 9 is the solution. 72 = 72 ? Student Practice 1: 8(9)= 72 ? 8 8a = 72

5. Holt CA Course 1 Solving Equations by Dividing 1-10 16 = 8rr is multiplied by 8. 8 2 = r Divide both sides by 8 to undo the multiplication. Check 16 = 8r Substitute 2 for r in the equation. Solve the equation. Check your answer. 2 is the solution. 16 = 16 ? Teacher Example 2: 16 = 8(2) ? 8 16 = 8r

6. Holt CA Course 1 Solving Equations by Dividing 1-10 18 = 3ww is multiplied by 3. 3 6 = w Divide both sides by 3 to undo the multiplication. Check 18 = 3w Substitute 6 for w in the equation. Solve the equation. Check your answer. 6 is the solution. 18 = 18 ? Student Practice 2: 18 = 3(6) ? 3 18 = 3w

7. Holt CA Course 1 Solving Equations by Dividing 1-10 The area of a rectangle is 56 square inches. Its length is 8 inches. What is its width? Teacher Example 3: Problem Solving Application Remember! For a rectangle, area = length  width

8. Holt CA Course 1 Solving Equations by Dividing 1-10 Teacher Example 3 Continued: 1 Understand the Problem The answer will be the width of the rectangle in inches. List the important information: The area of the rectangle is 56 square inches. The length of the rectangle is 8 inches. Draw a diagram to represent this information. 56 8 w

9. Holt CA Course 1 Solving Equations by Dividing 1-10 Teacher Example 3 Continued: 2 Make a Plan You can write and solve an equation using the formula for area. To find the area of a rectangle, multiply its length by its width. w l A = l w 56 = 8w

10. Holt CA Course 1 Solving Equations by Dividing 1-10 Example 3 Continued: 56 = 8w Solve 3 88 7 = w So the width of the rectangle is 7 inches. w is multiplied by 8. Divide both sides by 8 to undo the multiplication.

11. Holt CA Course 1 Solving Equations by Dividing 1-10 Example 3 Continued: Look Back Arrange 56 identical squares in a rectangle. The length is 8, so line up the squares in rows of 8. You can make 7 rows of 8, so the width of the rectangle is 7. 4

12. Holt CA Course 1 Solving Equations by Dividing 1-10 Student Practice 3: The area of a rectangle is 48 square inches. Its width is 8 inches. What is its length?

13. Holt CA Course 1 Solving Equations by Dividing 1-10 Student Practice 3: 1 Understand the Problem The answer will be the length of the rectangle in inches. List the important information: The area of the rectangle is 48 square inches. The width of the rectangle is 8 inches. Draw a diagram to represent this information. 48 l 8

14. Holt CA Course 1 Solving Equations by Dividing 1-10 Student Practice 3 Continued: 2 Make a Plan You can write and solve an equation using the formula for area. To find the area of a rectangle, multiply its length by its width. w l A = l w 48 = l 8

15. Holt CA Course 1 Solving Equations by Dividing 1-10 Student Practice 3 Continued: 48 = 8 l Solve 3 88 6 = l So the length of the rectangle is 6 inches. l is multiplied by 8. Divide both sides by 8 to undo the multiplication.

16. Holt CA Course 1 Solving Equations by Dividing 1-10 Practice 3 Continued: Look Back Arrange 48 identical squares in a rectangle. The width is 8, so line up the squares in columns of 8. You can make 6 columns of 8, so the length of the rectangle is 6. 4

17. Holt CA Course 1 Solving Equations by Dividing 1-10 Solve each equation. 1. 2. 78 = 13x 1.10 Warm-Up 3. The area of a board game is 468 square inches. Its width is 18 inches. What is the length?