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

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Intern
Joined: 16 Sep 2003
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If (a,b) and (a-3,b-k) are 2 points on line which is given [#permalink]  16 Sep 2003, 13:29
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?
Senior Manager
Joined: 22 May 2003
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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
Intern
Joined: 28 Aug 2003
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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
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