anonymous
  • anonymous
Which of these ordered pairs could not be a dilation of (8, -4)? (2, -1) (2, -2) (16, -8) (4, -2) What scale factor is shown in the graph? in the comments--- An image has point W'(7, -3), and the pre-image has point W(21, -9). This is an enlargement. True False
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
anonymous
  • anonymous
freckles
  • freckles
so I guess the example didn't click?

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freckles
  • freckles
\[(2,-1)=(8a,-4a) \text{ holds if } (2,-1) \text{ is a dilation of } (8,-4) \\ \text{ this means we should find the same } a \text{ such that } 2=8a \text{ and } -1=-4a \] and if we don't than it is not a dilation
freckles
  • freckles
but if we do then it is
freckles
  • freckles
solving both of those give a=1/4 since both give the same a value then (2,-1) is a dilation of (8,-4)
freckles
  • freckles
\[(2,-2)=(8a,-4a)\] see if you get the same a here for both equations 2=8a and -2=-4a
anonymous
  • anonymous
okay
freckles
  • freckles
a way to look at the next question... |dw:1436979028825:dw| |dw:1436979032167:dw| which is the longer line the image or the image after the dilation?

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