1. 2.5 Literal Equations and Formulas I can rewrite and use literal equations and formulas

2. Literal Equations Involves two or more variables You can use methods learned previously to isolate any particular variable. Ex: 11x + 3y = 67

3. Writing a Literal Equation You are ordering pizzas and sandwiches. You have a budget of $80. Write an equation and define your variables. Let x be the number of pizzas and y be the number of sandwiches. 10x + 5y = 80

4. Solving for one of the Variables How many sandwiches can you buy if you buy 3 pizzas? So x = 3 and we must solve for y. 10x + 5y = 80 5y = 80 – 10x y = 16 – 2x y = 16 – 2(3) y = 16 – 6 = 10 sandwiches

5. Rewriting a literal equation

6. Formulas An equation that states a relationship between quantities. They are special types of literal equations. Some use the same variables, but they are defined differently. It is so important to DEFINE YOUR VARIABLES! Ex:

7. You try! What is the radius of a circle with a circumference of 64 ft? Round to the tenth. Formula for circumference: Solve for r: Substitute 64 for C: Use 3.14 for pi:

8. Assignment ODDS ONLY P.112 #11-33