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ihavemathquestions Group Title

Determine whether y varies directly with x. If so, find the constant of variation k. 3y = –7x – 18

  • one year ago
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  1. ihavemathquestions Group Title
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    • one year ago
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    @agent0smith

    • one year ago
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    For the constant of variation, we need it to look like y = kx. Let's divide both sides of 3y = –7x – 18 by 3, to get \[y = -\frac{7 }{ 3 }x –\frac{ 18 }{3 }\] Try comparing \[y= kx \]to\[y = -\frac{7 }{ 3 }x –\frac{ 18 }{3 }\]

    • one year ago
  4. ihavemathquestions Group Title
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    so is the answer B?

    • one year ago
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    @agent0smith

    • one year ago
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    But notice that we have\[ y = -\frac{7 }{ 3 }x –\frac{ 18 }{3 } \] Does it look like y=kx? or y=kx minus 18/3?

    • one year ago
  7. ihavemathquestions Group Title
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    no they don't so its D

    • one year ago
  8. agent0smith Group Title
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    For constant of variation, you only want y = kx, not y = kx plus or minus some number.

    • one year ago
  9. ihavemathquestions Group Title
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    so there is no constant of variation its no

    • one year ago
  10. agent0smith Group Title
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    Correct :) *If* it was just \[y = -\frac{7 }{ 3 }x\] then it would be in the form y = kx.

    • one year ago
  11. ihavemathquestions Group Title
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    thanks baby xo

    • one year ago
  12. agent0smith Group Title
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    haha no prob :)

    • one year ago
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