1. Warm Up
Combine like terms: 6x – 2xy – 7z + 4 – 3y + x – 7xy + 3y xz

2. Adding and Subtracting Polynomials

3. Example 1: Add the following polynomials: (9y - 7x + 15a) + (-3y + 8x - 8a)

4. Example 2: Add the following polynomials: (3a2 + 3ab - b2) + (4ab + 6b2)

5. Example 3: Add the following polynomials: (4x2 - 2xy + 3y2) + (-3x2 - xy + 2y2)

6. Example 4: Subtract the following polynomials: (9y - 7x + 15a) - (-3y + 8x - 8a)

7. Example 5: Subtract the following polynomials: (7a - 10b) - (3a + 4b)

8. Example 6: Subtract the following polynomials: (4x2 - 2xy + 3y2) - (-3x2 - xy + 2y2)

9. Find the sum or difference. (5a – 3b) + (2a + 6b)

10. Find the sum or difference. (5a – 3b) – (2a + 6b)