anonymous
  • anonymous
Sophia is dilating a figure. One of her pre-image points with coordinates (-3, 5) has an image with coordinates (-9, 15). If one of the other image points has coordinates (3, 1), what are the coordinates of its pre-image point? (9, 3) (1,) (1, 3) (-3, -1) Which of these ordered pairs could not be a dilation of (8, -4)? (2, -1) (2, -2) (16, -8) (4, -2)
Mathematics
schrodinger
  • schrodinger
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freckles
  • freckles
hey so -3*what=-9 5*what=15
anonymous
  • anonymous
3
freckles
  • freckles
right

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freckles
  • freckles
\[3 \cdot (-3,5)=(3 \cdot (-3),3(5))=(-9,15)\]
freckles
  • freckles
so what is 3 times (3,1)
freckles
  • freckles
\[3 \cdot (3,1) =(3 \cdot 3,3 \cdot 1)=?\]
anonymous
  • anonymous
9,3
freckles
  • freckles
right
freckles
  • freckles
well (9,3)
freckles
  • freckles
\[a \cdot (8,-4)=(8a,-4a) \]
freckles
  • freckles
(2, -1) (2, -2) (16, -8) (4, -2) for which of these choices do you get a different a value that is : for example: let's look at the first point (2,-1) (8a,-4a)=(2,-1) 8a=2 gives a=1/4 -4a=-1 gives a=1/4 since both of these a's are the same than (2,-1) is a dilation of (8,-4)
freckles
  • freckles
try the others you want both a's to be the same
anonymous
  • anonymous
okay
anonymous
  • anonymous
..
freckles
  • freckles
what do the dots mean? does that mean you don't understand the example?
anonymous
  • anonymous
no im thinking

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