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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]

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04 Sep 2008, 02:38
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Which of the following points is not on the line $$y = 5x + 3$$ ?

* $$(\frac{1}{2}, \frac{11}{2})$$
* $$(\frac{1}{3}, \frac{14}{3})$$
* $$(\sqrt{8}, 3 + 10*\sqrt{2})$$
* $$(\sqrt{4}, 13)$$
* $$(\sqrt{2}, \frac{31}{3})$$
[Reveal] Spoiler: OA
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Re: Which of the following points is not on the line y = 5x + 3 [#permalink]

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04 Sep 2008, 03:04
E

simply plug in all the numbers
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Re: Which of the following points is not on the line y = 5x + 3 [#permalink]

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04 Sep 2008, 03:09
E.

I used substitution.
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Re: Which of the following points is not on the line y = 5x + 3 [#permalink]

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04 Sep 2008, 08:37
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: Which of the following points is not on the line y = 5x + 3 [#permalink]

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04 Sep 2008, 08:52
When need to plug in always pick E to start with. GMAT wants us to start at A and run through E
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Re: Which of the following points is not on the line y = 5x + 3 [#permalink]

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01 Nov 2016, 00:20
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Which of the following points is not on the line y = 5x + 3   [#permalink] 01 Nov 2016, 00:20
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