1. 2-8 Solving for a Specific Variable Algebra 1 Glencoe McGraw-HillLinda Stamper

2. The formula is now written with l isolated on one side of the equal sign. It is written in terms of l. 1 Some equations have more than one variable. It is often useful to solve these equations for one of the variables. Solve A = l w for l

3. Write variable term first! Solve for y in -8x + 4y = 36. Divide all terms by 4. Add 8x to both sides. Divide by 4. Write the problem.

4. Write variable term first! Solve for y in 9x - 4y = 7. Subtract -9x Divide by -4. Write the problem.

5. Example 1 Solve for y in 3x − 4y = 7. Divide all terms by -4. Write variable term first! Example 2 Solve for n in 15 = 3n + 6p. Example 3 Solve for m in 3m + 7 = n. Example 4 Solve for y in -12x +4y = 24.

6. Example 5 3y - 1 = y + 5x Example 6 5y + 12x = 9 Solve each equation for y.

7. Example 7 2a − b = ca + 5 Example 8 6a – 18 = ab + c Solve each equation for a.

8. Example 9 Solve P = 2 l + 2w for w. What is this formula? Formula for perimeter of a rectangle. 1 Example 10 for F. What is this formula? Temperature conversion from Celsius to Fahrenheit.

9. 2-A12 SKILLS PRACTICE Wkbk. Page 17 # 1–21. (Complete SKILLS Workbook problems on binder paper.)