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anonymous

  • one year ago

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)

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  1. freckles
    • one year ago
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    hey so -3*what=-9 5*what=15

  2. anonymous
    • one year ago
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    3

  3. freckles
    • one year ago
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    right

  4. freckles
    • one year ago
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    \[3 \cdot (-3,5)=(3 \cdot (-3),3(5))=(-9,15)\]

  5. freckles
    • one year ago
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    so what is 3 times (3,1)

  6. freckles
    • one year ago
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    \[3 \cdot (3,1) =(3 \cdot 3,3 \cdot 1)=?\]

  7. anonymous
    • one year ago
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    9,3

  8. freckles
    • one year ago
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    right

  9. freckles
    • one year ago
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    well (9,3)

  10. freckles
    • one year ago
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    \[a \cdot (8,-4)=(8a,-4a) \]

  11. freckles
    • one year ago
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    (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)

  12. freckles
    • one year ago
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    try the others you want both a's to be the same

  13. anonymous
    • one year ago
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    okay

  14. anonymous
    • one year ago
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    ..

  15. freckles
    • one year ago
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    what do the dots mean? does that mean you don't understand the example?

  16. anonymous
    • one year ago
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    no im thinking

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