1. Lesson 3-4 Solving Multi-Step Equations

2. Definition Working Backward- work the axiom of order backwards.

3. Examples Solve each problem by working backwards. –A) A number is multiplied by seven, and then the product is added to 13. The result is 55. What is the number? –B) A bacteria population triples in number each day. If there are 2,187,000 bacteria on the seventh day, how many bacteria were there on the first day?

4. Definition Multi-step equations- an equation with more than one type of operation.

5. Solve. Then check your solution.

6. Write an equation for the problem below. Then solve the equation. Eight more than five times a number is negative 62.

7. Definitions Consecutive integers- are integers in counting order, such as 7, 8, and 9. Number theory- The study of numbers and the relationship between them.

8. Find three consecutive odd integers whose sum is 57. Find three consecutive integers whose sum is 42.