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douglas12

  • 2 years ago

Determine whether y varies directly with x. If so, find the constant of variation k. –7y = –3x A. yes; 3/7 B. yes; 7/3 C. yes; -3 D. no

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  1. Jhannybean
    • 2 years ago
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    First ask yourself - what is the formula for Direct Variation? When you google this - you'll find that this formula is shown as \(\large \color{green}{ y = kx}\). We've got \(\large \color{red}{-7y=-3x}\) How do we change this to fit the form of direct variation? We divide both sides of the //equation by -7 \[\large \cfrac{-7y}{-7} = \cfrac{-3}{-7}x\] Simplifying both sides of the equation, what do we get?

  2. douglas12
    • 2 years ago
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    3/7

  3. Jhannybean
    • 2 years ago
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    That's good. \[\large y=\color{blue}{\cfrac{3}{7}}x\]\(\large \cfrac{3}{7}\) is out "k" value.

  4. Jhannybean
    • 2 years ago
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    our*

  5. douglas12
    • 2 years ago
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    ok thanks

  6. Jhannybean
    • 2 years ago
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    no problem :)

  7. Jhannybean
    • 2 years ago
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    Thank you :)

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