LifeIsADangerousGame
  • LifeIsADangerousGame
Help with some geometry?
Geometry
schrodinger
  • schrodinger
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LifeIsADangerousGame
  • LifeIsADangerousGame
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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ParthKohli
  • ParthKohli
Hmm, \((x,y) \mapsto (y + 7, 2x - 4)\). In the same way, \((4,5) \mapsto (5 + 7, 2(4) - 4)\)
LifeIsADangerousGame
  • LifeIsADangerousGame
That would be 12,4 wouldn't it? 5 + 7 equals 12 and 2(4) is 8 minus 4 that's 4.

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ParthKohli
  • ParthKohli
Good point.
LifeIsADangerousGame
  • LifeIsADangerousGame
My possible answers are, (4,-4), (11,-12), (3,4), (12,-11)
ParthKohli
  • ParthKohli
Well, there's a thing you're doing wrong there.
ParthKohli
  • ParthKohli
Point \(\rm C\) is actually \((4,-4)\)
ParthKohli
  • ParthKohli
Does that make everything better?
LifeIsADangerousGame
  • LifeIsADangerousGame
With it being (4,-4) I would have the answer of (3,4) I think I'll go with that @ParthKohli
LifeIsADangerousGame
  • LifeIsADangerousGame
Thanks Parth :D
ParthKohli
  • ParthKohli
:-)

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