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Homework Explained - Math Practice 101

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Grade 8 HMH Go Math - Answer Keys
Chapter 7: Solving Linear Equations; Lesson 3:Equations with the Distributive Property


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  Independent Practice  

  • Question 13 (request help)

    Multistep

    Martina is currently 14 years older than her cousin Joey. In 5 years she will be 3 times as old as Joey. Use this information to answer the following questions.

    a. If you let x represent Joey’s current age, what expression can you use to represent Martina’s current age?

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  • Question 13 (request help)

    b. Based on your answer to part a, what expression represents Joey’s age in 5 years? What expression represents Martina’s age in 5 years?

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  • Question 13 (request help)

    c. What equation can you write based on the information given?

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  • Question 13 (request help)

    d. What is Joey’s current age? What is Martina’s current age?

  • Joey’s current age   
    Martina’s current age   
  • Question 14 (request help)

    As part of a school contest, Sarah and Luis are playing a math game. Sarah must pick a number between 1 and 50 and give Luis clues so he can write an equation to find her number. Sarah says, “If I subtract 5 from my number, multiply that quantity by 4, and then add 7 to the result, I get 35.” What equation can Luis write based on Sarah’s clues and what is Sarah’s number?

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  • Question 15 (request help)

    Critical Thinking

    When solving an equation using the Distributive Property that involves distributing fractions, usually the first step is to multiply by the LCD to eliminate the fractions in order to simplify computation. Is it necessary to do this to solve \(\large\frac{1}{2}\small(4\text{x} + 6) = \large\frac{1}{3}\small(9\text{x} - 24)\)? Why or why not?

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  • Question 16 (request help)

    Solve the equation given in Exercise 15 with and without using the LCD of the fractions. Are your answers the same?

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