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Which of the following points is not on the line y = 5x + 3

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Which of the following points is not on the line y = 5x + 3 [#permalink] New post 04 Sep 2008, 01:38
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Which of the following points is not on the line y = 5x + 3 ?



* (\frac{1}{2}, \frac{11}{2})
* (\frac{1}{3}, \frac{14}{3})
* (\sqrt{8}, 3 + 10*\sqrt{2})
* (\sqrt{4}, 13)
* (\sqrt{2}, \frac{31}{3})
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Re: lie on the line? [#permalink] New post 04 Sep 2008, 02:04
E

simply plug in all the numbers
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Re: lie on the line? [#permalink] New post 04 Sep 2008, 02:09
E.

I used substitution.
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Re: lie on the line? [#permalink] New post 04 Sep 2008, 07:37
arjtryarjtry wrote:
Which of the following points is not on the line y = 5x + 3 ?



* (\frac{1}{2}, \frac{11}{2})
* (\frac{1}{3}, \frac{14}{3})
* (\sqrt{8}, 3 + 10*\sqrt{2})
* (\sqrt{4}, 13)
* (\sqrt{2}, \frac{31}{3})



As y = 5x + 3 is linear equation
when x is rational y is rational
when x is irrational y is combination of irrational..

Here I can pick E without plugging in the values.
A,B,D -- > both x and y are rational number.. possibly they lie on the line
C --> x =2sqrt(2) y= 10sqrt(2)+3 both are irrational numbers(sqrts0 .. possible thy lie on the line.

E -- x=sqrt(2) Y=13.. x is irrational number y is rational number.. not a soltuion.
so you can plug in E first to double check.
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Re: lie on the line? [#permalink] New post 04 Sep 2008, 07:52
When need to plug in always pick E to start with. GMAT wants us to start at A and run through E
Re: lie on the line?   [#permalink] 04 Sep 2008, 07:52
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Which of the following points is not on the line y = 5x + 3

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