anonymous
  • anonymous
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
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
Let y = gallons of gasoline Let x = number of miles y starts at 15 and then you subtract 0.03 gal. for each x.
anonymous
  • anonymous
so its the first one?
anonymous
  • anonymous
Does the first one include the subtraction I mentioned?

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anonymous
  • anonymous
y=15-.03x
anonymous
  • anonymous
c
anonymous
  • anonymous
anonymous
  • anonymous
when x=0 then y=15 and with every minute y decreases by 0.03 , so u get y=15-0.03x
anonymous
  • anonymous
@CliffSedge u a mod
anonymous
  • anonymous
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
anonymous
  • anonymous
@akash_809 does that matter?
anonymous
  • anonymous
@EmmaH do u get it
anonymous
  • anonymous
m is negative as y is decreasing
anonymous
  • anonymous
it cant b that because it is increasing because it increases as the cars goes
anonymous
  • anonymous
could you try to explain step by step please
anonymous
  • anonymous
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
anonymous
  • anonymous
i know i must sound stupid but that doesnt make sense to me sorry

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