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LifeIsADangerousGame

  • 2 years ago

Help with some geometry?

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  1. LifeIsADangerousGame
    • 2 years ago
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    If you transform triangle ABC (red triangle) using (x,y)->(y+7, 2x-4). Where would you place point C’? (4,5) I keep getting (12,4) but that isn't right, what am I doing wrong?

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  2. ParthKohli
    • 2 years ago
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    Hmm, \((x,y) \mapsto (y + 7, 2x - 4)\). In the same way, \((4,5) \mapsto (5 + 7, 2(4) - 4)\)

  3. LifeIsADangerousGame
    • 2 years ago
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    That would be 12,4 wouldn't it? 5 + 7 equals 12 and 2(4) is 8 minus 4 that's 4.

  4. ParthKohli
    • 2 years ago
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    Good point.

  5. LifeIsADangerousGame
    • 2 years ago
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    My possible answers are, (4,-4), (11,-12), (3,4), (12,-11)

  6. ParthKohli
    • 2 years ago
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    Well, there's a thing you're doing wrong there.

  7. ParthKohli
    • 2 years ago
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    Point \(\rm C\) is actually \((4,-4)\)

  8. ParthKohli
    • 2 years ago
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    Does that make everything better?

  9. LifeIsADangerousGame
    • 2 years ago
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    With it being (4,-4) I would have the answer of (3,4) I think I'll go with that @ParthKohli

  10. LifeIsADangerousGame
    • 2 years ago
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    Thanks Parth :D

  11. ParthKohli
    • 2 years ago
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    :-)

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