Evaluation of algebraic expressions and formulas
1. Evaluation of algebraic expressions
- The process of replacing each variable with its value to find the actual value of an algebraic expression is called substitution.
2. Formulas
- The area of a rectangle is given by
- Area = Length x Width
- A = lw
- This equality of connecting two or more variables is called a formula. When the values of l and w are known, we can find the value of A in the formula by substitution.
3. Home Work:
- Handout: two pages
- Workbook:
- page 15: 3, 4, 5
- Page 16: 11, 12, 13
- Page 17: 14
- Page 19: 26, 27
- Page 20: 28