Algebra 1 Unit 1 Equations Review
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Questions and Answers

What is the solution for the equation $3(x - 3) = 3x - 6$?

no solution

What is the value of b in the equation $\frac{b}{3} - 1 = 5$?

b = 18

What is the value of k in the equation $4k - 5k = 10 + k$?

k = -5

What is the value of x in the equation $6(2x + 10) = 10(x + 6)$?

<p>x = 0</p> Signup and view all the answers

What are the solutions for the equation $-2(x - 5) = 10 - 2x$?

<p>all real numbers/identity/infinite solutions</p> Signup and view all the answers

What is the solution for x in the equation $\frac{1}{5}x - \frac{2}{3} = \frac{1}{4}x + 1$?

<p>x = -\frac{100}{3} or -33.33</p> Signup and view all the answers

If Phil, Claire, and Alex combined spend $275, how much did Phil spend if Claire spends $25 more than Phil and Alex spends half as much as Phil?

<p>Phil = $100, Claire = $125, Alex = $50</p> Signup and view all the answers

What are the dimensions of a rectangle with a perimeter of 82 cm, where the length is one more than three times the width?

<p>length = 31 cm, width = 10 cm</p> Signup and view all the answers

What are three consecutive odd integers whose sum is -39?

<p>Integers are -15, -13, and -11</p> Signup and view all the answers

How old are Rob, Charles, and Kristi if the sum of their ages is 105 years and Kristi is 5 years older than Charles, while Rob is 20 years younger than twice Charles' age?

<p>Charles = 30 years old, Kristi = 35 years old, Rob = 40 years old</p> Signup and view all the answers

Study Notes

Equations and Solutions

  • No Solution: When solving 3(x - 3) = 3x - 6, the result is that there is no solution.
  • Value Identification: For the equation b/3 - 1 = 5, solving gives b = 18.
  • Negative Result: The equation 4k - 5k = 10 + k results in k = -5.
  • Zero Solution: In the equation 6(2x + 10) = 10(x + 6), the solution yields x = 0.
  • Infinite Solutions: The equation -2(x - 5) = 10 - 2x has infinite solutions, indicating all real numbers are a solution.
  • Fractional Solution: For 1/5 x - 2/3 = 1/4x + 1, the resulting value of x is -100/3 or approximately -33.33.

Word Problems and Equations

  • Shopping Scenario: Phil, Claire, and Alex combined spend $275. Formulating an equation from their spending habits:

    • Phil = x
    • Claire = x + 25
    • Alex = 1/2x
    • Equation: x + (x + 25) + (1/2x) = 275 leads to Phil spending $100, Claire $125, and Alex $50.
  • Rectangle Perimeter: For a rectangle with a perimeter of 82 cm, with length being one more than three times the width:

    • Length = 3w + 1, Width = w
    • Set up the equation 2(3w + 1) + 2w = 82 leads to dimensions of width = 10 cm and length = 31 cm.
  • Odd Integers Sum: The sum of three consecutive odd integers equaling -39 can be structured:

    • 1st integer: x, 2nd: x + 2, 3rd: x + 4
    • Equation: x + (x + 2) + (x + 4) = -39 solves to integers -15, -13, and -11.
  • Siblings' Ages: For siblings Rob, Charles, and Kristi with a combined age of 105:

    • Charles = x, Kristi = x + 5, Rob = 2x - 20
    • Using the equation 4x - 15 = 105 results in ages: Charles = 30 years, Kristi = 35 years, Rob = 40 years.

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Test your knowledge with these flashcards that cover key equations and word problems from Algebra 1 Unit 1. Each card presents a different problem to solve, helping you understand various solution types, including specific values and identities.

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