anonymous
  • anonymous
PLEASE HELP!?!?!?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
mathstudent55
  • mathstudent55
Divide the difference in y values by the difference in x values. \(\dfrac{f(-4) - f(-5)}{-4 - (-5)} \) Read f(-4) and f(-5) off the graph.
anonymous
  • anonymous
I'm not sure where they are

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anonymous
  • anonymous
are they -4 and 0?
anonymous
  • anonymous
anonymous
  • anonymous
f(-4) would be the y value at x = -4
anonymous
  • anonymous
So yes, they would be -4 and 0
anonymous
  • anonymous
okay, what next?
anonymous
  • anonymous
Plug those in to the equation mathstudent gave you, for the f(-4) and f(-5)
anonymous
  • anonymous
so the answer is -4?
anonymous
  • anonymous
Which should be -4/1 which I don't see in your options
anonymous
  • anonymous
yeah, so what is the right answer out of my options?
anonymous
  • anonymous
Well we should be able to do it with just the two points, but I don't know why the answer isn't there
anonymous
  • anonymous
so I just guess and hope that the answer is right?
anonymous
  • anonymous
I wouldn't just guess
anonymous
  • anonymous
so then what do I do?
anonymous
  • anonymous
I guess I would give the closest answer (-5), but I wouldn't like it.....
anonymous
  • anonymous
okay. well thanks anyway :)
mathstudent55
  • mathstudent55
It looks like f(-5) = 1, and f(-4) = -4 \(\dfrac{-4 - 1}{-4 - (-5)} = \dfrac{-5}{1} = -5\)
anonymous
  • anonymous
oh, so the answer is -5?
mathstudent55
  • mathstudent55
Yes.
anonymous
  • anonymous
thank you :)
mathstudent55
  • mathstudent55
yw

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