Lesson 3-4 Solving Multi-Step Equations. Definition Working Backward- work the axiom of order backwards.

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Presentation transcript:

Lesson 3-4 Solving Multi-Step Equations

Definition Working Backward- work the axiom of order backwards.

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?

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

Solve. Then check your solution.

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

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.

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