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January 25, 2015

January 25, 2015

Posted by **Lyn** on Monday, June 20, 2011 at 10:54pm.

I'm not quite sure how to do this one.. I've tried the distance and midpoint formula, but I'm confused.

I don't what to do with the (a-1)^2 part.

5= (4-0)^2 + (a-1)^2

5= 16 + (a-1)^2

Any help or can give me a site with detailed examples would greatly be appreciated. Thanks.

- Algebra -
**Reiny**, Monday, June 20, 2011 at 11:44pmThe formula for distance between two point is

d = √( (y2-y1)^2 + (x2-x1)^2

so

5 = √((a-1)^2 ++ (4-1)^2 )

square both sides

25 = (a-1)^2 = 9

16 = (a-1)^2

take √ of both sides

4 = ± (a-1)

a-1 = ±4

a = 5 or a= -3

- Algebra -
**Lyn**, Tuesday, June 21, 2011 at 12:35pmThank you Reiny!

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