Chapter 3 Lesson 6 Writing Two-Step Equations pgs

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Presentation transcript:

Chapter 3 Lesson 6 Writing Two-Step Equations pgs. 126-130 What you will learn: Write verbal sentences as two-step equations Solve verbal problems by writing and solving two-step equations

In Chapter 1, you learned how to write verbal phrases as expressions. Phrase: the sum of 4 times some number and 99 Expression: 4n + 99 An equation is a statement that two expressions are equal. The expressions are joined with an equals sign. Look for the words equals or is equal to when you translate sentences into equations Sentence: The sum of 4 times some number and 99 is 299 299 4n + 99 = Equation:

Translate sentences into equations: Six more than twice a number is -20 Eighteen is 6 less than four times a number The quotient of a number and 5, increased by 8, is equal to 14 2n + 6 = -20 18 = 4n - 6 n + 8 = 14 5 Remember: Read carefully what the problem is saying. Don’t mix up quotient () and product ().

Translate and Solve an Equation Seven more than three times a number is 31. Find the number. Words: Seven more than three times a number is 31 Variables: Let n = the number Equation: 3n + 7 = 31 Check: 3(8) + 7 = 31 24 + 7 = 31 31 = 31  3n + 7 = 31 3n + 7 -7 = 31 - 7 3n = 24 3 3 n = 8

Week Amount 5(0)+60=60 1 5(1)+60=65 2 5(2)+60=70 3 5(3)+60=75 Write and solve a two-step equation Suppose you are saving money to buy a scooter that costs $100. You have already saved $60 and plan to save $5 each week. How many weeks will you need to save? Explore: You have already saved $60 and you plan to save $5 a week until you have $100. Plan: Organize the data for the first few weeks in a table. Notice the pattern. Write an equation To represent the Situation. Let x Equal the number of weeks. Week Amount 5(0)+60=60 1 5(1)+60=65 2 5(2)+60=70 3 5(3)+60=75 5x + 60 = 100

Now solve Check: 5(8) + 60 = 100 40 + 60 = 100 100 = 100  5x + 60 = 100 5x + 60 -60 = 100 - 60 5x = 40 5 5 x = 8 You need to save $5 each week for 8 weeks.

In the 2000 Summer Olympics, the United States won 9 more medals than Russia. Together they won 185 medals. How many more medals did the United States win? Words: Together they won 185 medals Variables: Let x = number of medals Russia won Then x + 9 = number of medals won by U.S. Equation: x + (x+9) = 185 Check: 88 + (88+9) = 185 88 + 97 = 185 185 = 185  Solve: x + (x + 9) = 185 2x + 9 = 185 2x + 9 -9 = 185 -9 2x = 176 2 2 x = 88 Russia won 88 medals U.S. won 97 medals

Homework Practice Page is by the door! Quiz tomorrow over 3-5 & 3-6