# Math Is Fun Forum

Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

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## #1 2013-05-15 04:11:43

mom
Member
Registered: 2012-04-25
Posts: 94

### value

I have no idea why but I completely forgot how to do this one.

find the value of a such that the three points (1,3), (6,5), and (a,-1) lie on the same line.

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## #2 2013-05-15 04:19:45

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: value

Hi mom;

Use the point point equation for the first two points and then just solve for a. a = - 9.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #3 2013-05-15 04:58:51

mom
Member
Registered: 2012-04-25
Posts: 94

### Re: value

Ok, thanks. No idea why it was throwing me off

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## #4 2013-05-15 05:02:07

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: value

You are welcome.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #5 2014-10-30 23:11:59

DeanPemberton
Member
From: USA
Registered: 2014-10-30
Posts: 20
Website

### Re: value

You use the formula of three points lying in the same line and find all the points of the line.  First you have to find the slope of the line then find by equation of line "y-y1=m(x-x1). Then definitely you will get its answer.

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