1. Problem Solving and Using Formulas
Chapter 1 Section 5
Problem Solving and Using Formulas

2. Strategies Read the problem for understanding.
Let x represent one of the unknown quantities
2) Write expressions for other unknown quantities in terms of x
3) Write an equation
4) Solve the equation and answer the question.
5) Check.

3. Example 3, page 58
The toll to a bridge cost $7. Commuters who use the bridge frequently have the option of purchasing a monthly discount pass for $30. With the discount pass the toll is reduced to $4. For how many bridge crossings per month will the total monthly cost without the discount pass be the same as the total monthly cost with the discount pass?

4. Solving a Formula for One of Its Variables
Solve like an equation.

5. Solve for the variable
h if
C if F =

6. Formulas that you know? Area of a Rectangle Area of a Square
Perimeter of a rectangle
Perimeter of a square
Area of a triangle
Perimeter of a triangle

7. Solve a problem using a formula
Page 68, # 43 The length of the rectangular tennis court at Wimbledon is 6 feet longer than twice the width. If the court’s perimeter is 228 feet, what are the court’s dimensions?