1. Textbook page 66 IAN page 87

2. Each side of the equation must be balanced. We balance an equation by doing the same thing to both sides of the equal sign.

3. Example 1 Solve each equation. Check your answers. Solving Subtraction Equations (A) p – 2 = 5 Do the opposite + 2 Do the same thing to both sides of the equation. + 2 p = 7 7 - 2 = 5 To check your work, substitute in the value of p.

4. Example 1 Solve each equation. Check your answers. Solving Subtraction Equations (B) 4 = x – 1.1 Do the opposite + 1.1 Do the same thing to both sides of the equation. + 1.1 5.1 = x 4 = 5.1 – 1.1 To check your work, substitute in the value of x.

5. Example 1 Solve each equation. Check your answers. Solving Subtraction Equations (C) x – 5.6 = 1.9 Do the opposite + 5.6 Do the same thing to both sides of the equation. + 5.6 x = 7.5 7.5 - 5.6 = 1.9 To check your work, substitute in the value of x.

6. Example 2 Mt. Rainier, in Washington, has a higher elevation than Mt. Shasta. The difference between their elevations is 248 feet. What is the elevation of Mt. Rainier? Write an equation and solve. Word Problem: Geography 248 = r – 14,162 +14,162 14,410 = r

7. 1. p - 8 = 9 2. 3 = x - 16 3. a – 1.3 = 1.8 4. 1.5 = y - 7 5. n - 24 = 9 6. 39 = d - 2 p = 17 x = 19 a = 3.1 y = 8.5 n = 33 d = 41