Sunday
December 21, 2014

Homework Help: Algergra

Posted by Kay on Friday, September 26, 2008 at 10:56pm.

I am stumped! I have been working on these problems for the longest time and I can not figure out what I am doing wrong. Some how when I get to the last two steps I mess up, and I am beyond frustrated.

The directions say:

Write an equation of the line containing the given point and perpendicular to the given line.

1. (-5,9) 5x=6y+7

2. (3,5) 4x+y=9

3. (3,-5) 6x+5y=7

To show you where I am messing up I am going to give you one I have already tried to do, then maybe someone can tell me where I am going wrong. I have a test on this tomorrow and I don't get it at ALL!

(4,6) x+9y=7

y= -1/9-7/9

Then you use the formula y-y1=m(x-x1)
so it would be

y-6=-1/9x+4

Then here is where I am having problems, when I try to multiply the -1/9 by 4 and then add 6 to it, I come up with the wrong answer.
I got y= -1/9x+10/9. The right answer is -1/9x+58/9. The answers all have to be in the formula of y=mx+b

Thanks for your help!

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