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If (a,b) and (a-3,b-k) are 2 points on line which is given

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If (a,b) and (a-3,b-k) are 2 points on line which is given [#permalink] New post 16 Sep 2003, 13:29
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If (a,b) and (a-3,b-k) are 2 points on line which is given by the equation x=3y -7, then what is the value of K?
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 [#permalink] New post 16 Sep 2003, 19:35
If the equation is x(y)=3y-7 I get k=9.

b=3a-7 and b-k=3(a-3)-7

Together: -k=-9 => k=9
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 [#permalink] New post 16 Sep 2003, 20:18
MartinMag wrote:
If the equation is x(y)=3y-7 I get k=9.

b=3a-7 and b-k=3(a-3)-7

Together: -k=-9 => k=9


Martin, you have plugged in wrong values in the equation.

They should be a = 3b - 7 and a - 3 = 3(b-k) -7
  [#permalink] 16 Sep 2003, 20:18
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If (a,b) and (a-3,b-k) are 2 points on line which is given

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