My Math Forum  

Go Back   My Math Forum > High School Math Forum > Algebra

Algebra Pre-Algebra and Basic Algebra Math Forum


Reply
 
LinkBack Thread Tools Display Modes
February 3rd, 2009, 01:14 PM   #1
Newbie
 
Joined: Feb 2009

Posts: 2
Thanks: 0

Hard Question for Me

Hi, been having problems with this question.. I got to be honest.. I need this to help me get through my college course, but it's a high school question.. just find it really hard.. thanks in advance:

1.)

Find the equation of a straight line that passes through the point (3, -1) and is perpendicular to the line y = 5x - 2. Give your answer in the form ax + by + c = 0

Thanks, if I find anymore difficult.. I will shout back.

Thanks,

Dan
Biggzi is offline  
 
February 3rd, 2009, 02:50 PM   #2
Senior Member
 
Joined: Sep 2008

Posts: 116
Thanks: 0

Re: Hard Question for Me

Point slope form of a line is given by:
y - y1 = m (x - x1)

You are given a point (3, -1) and just need to find the slope. You know the slope of the new line is perpindicular to the line y = 5x - 2 which has a slope of 5. A perpindicular slope is the negative recipricole of that; so -1/5.

Plug in these values to the point slope equation of a line:
y - (-1) = -1/5 ( x - 3)
y + 1 = -(x - 3) / 5

Then, rewrite the equation in standard form, the form being asked for:
5 (y + 1) = -(x -3)
5y +5 = 3 - x
5y + x + 5 -3 = 0
5y + x +2 = 0

Wrote this all in a rush, headed out of my office for the day, though if you have a question, feel free to ask and I'll reply later tonight at my house.
shynthriir is offline  
February 4th, 2009, 10:23 AM   #3
Newbie
 
Joined: Feb 2009

Posts: 2
Thanks: 0

Re: Hard Question for Me

Thank you good sir
Biggzi is offline  
Reply

  My Math Forum > High School Math Forum > Algebra

Tags
hard, question



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
cos question hard darandoma Algebra 2 September 19th, 2011 06:46 AM
very hard question riotsandravess Advanced Statistics 4 November 3rd, 2010 07:22 PM
very hard question riotsandravess Advanced Statistics 0 October 28th, 2010 02:21 PM
Very hard question mathhelp123 Calculus 21 October 6th, 2009 06:21 AM
really Hard question helpmewithmath Algebra 3 November 14th, 2007 11:12 AM





Copyright © 2018 My Math Forum. All rights reserved.