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EmmaH

  • 3 years ago

You drive a car that holds 15 gallons of gasoline. Your car uses 0.03 gal per mi. Which equation best represents this information? y = 0.03x + 15 y = 0.03x - 15 y = -0.03x + 15 y = -0.03x - 15

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  1. CliffSedge
    • 3 years ago
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    Let y = gallons of gasoline Let x = number of miles y starts at 15 and then you subtract 0.03 gal. for each x.

  2. EmmaH
    • 3 years ago
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    so its the first one?

  3. CliffSedge
    • 3 years ago
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    Does the first one include the subtraction I mentioned?

  4. akash_809
    • 3 years ago
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    y=15-.03x

  5. akash_809
    • 3 years ago
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    c

  6. CliffSedge
    • 3 years ago
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    @akash_809 http://openstudy.com/code-of-conduct

  7. akash_809
    • 3 years ago
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    when x=0 then y=15 and with every minute y decreases by 0.03 , so u get y=15-0.03x

  8. akash_809
    • 3 years ago
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    @CliffSedge u a mod

  9. EmmaH
    • 3 years ago
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    no but im using y=mx+b which means m=what could change which is .03 and then b=15 because it is your priginal so shouldnt it be y=.03x+15

  10. CliffSedge
    • 3 years ago
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    @akash_809 does that matter?

  11. akash_809
    • 3 years ago
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    @EmmaH do u get it

  12. akash_809
    • 3 years ago
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    m is negative as y is decreasing

  13. EmmaH
    • 3 years ago
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    it cant b that because it is increasing because it increases as the cars goes

  14. EmmaH
    • 3 years ago
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    could you try to explain step by step please

  15. akash_809
    • 3 years ago
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    what is slope of a line or any function y=f(x)...it is m=dy/dx i.e rate of change of y wrt x and here rate of change of y i.e fuel is negative w.r.t x...now is it better

  16. EmmaH
    • 3 years ago
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    i know i must sound stupid but that doesnt make sense to me sorry

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