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ihavemathquestions

  • 3 years ago

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

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  1. ihavemathquestions
    • 3 years ago
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  2. ihavemathquestions
    • 3 years ago
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    @agent0smith

  3. agent0smith
    • 3 years 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\[y = -\frac{7 }{ 3 }x –\frac{ 18 }{3 }\]

  4. ihavemathquestions
    • 3 years ago
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    so is the answer B?

  5. ihavemathquestions
    • 3 years ago
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    @agent0smith

  6. agent0smith
    • 3 years 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?

  7. ihavemathquestions
    • 3 years ago
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    no they don't so its D

  8. agent0smith
    • 3 years ago
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    For constant of variation, you only want y = kx, not y = kx plus or minus some number.

  9. ihavemathquestions
    • 3 years ago
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    so there is no constant of variation its no

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

  11. ihavemathquestions
    • 3 years ago
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    thanks baby xo

  12. agent0smith
    • 3 years ago
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    haha no prob :)

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