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Ninth Grade (Grade 9) Direct and Inverse Variation Questions

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Grade 9 Direct and Inverse Variation
Which of the following equations is an example of direct variation?
  1. 3y = 6x + 1
  2. 2y = 12x
  3. 2y + x = 7
  4. All of the above represent direct variation.
Grade 9 Direct and Inverse Variation
Which relationship is a direct variation?
  1. x = 1, 2, 3, 4 and y = -1, 0, 1, 2
  2. x = 1, 2, 3, 4 and y = 0, -1, -2, -3
  3. x = 1, 2, 3, 4 and y = 3, 5, 7, 9
  4. x = 1, 2, 3, 4 and y = 3, 6, 9, 12
Grade 9 Direct and Inverse Variation
Grade 9 Direct and Inverse Variation
Which equation is a direct variation?
  1. [math]y = -0.7x[/math]
  2. [math]y = 21/x[/math]
  3. [math]y - x = 4[/math]
  4. [math]y = 3x + 2[/math]
Grade 9 Direct and Inverse Variation CCSS: HSA-CED.A.2
Choose the equation that describes the variation: v varies directly with t; v = 16 when t = 2.
  1. [math]v=kt[/math]
  2. [math]v=k/t[/math]
  3. [math]v=8t[/math]
  4. [math]v=8/t[/math]
Grade 9 Direct and Inverse Variation
Grade 9 Direct and Inverse Variation
Grade 9 Direct and Inverse Variation CCSS: HSA-CED.A.2
Suppose y varies inversely with x and x = 12 when y = 3. What is the equation of the inverse variation?
  1. [math]y/x = 36[/math]
  2. [math]y = 12/3[/math]
  3. [math]y = 36/x[/math]
  4. [math]12 = 3/y[/math]
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