View Full Version : Algebra using two points
kidlow
Sep 19, 2007, 08:26 PM
I need help on this problem it goes...
write an equation of the line that passes through (6,-10) and is perpendicular to the line that passes (4,-6) and (3,-4).
need step by step help please thanks.
KISS
Sep 19, 2007, 08:55 PM
Your taxing my memory. You can find the eqn of a line passing through (4,-6) and (3,-4) using the 2 point form and find the slope.
A perpendicular line #1 to another line #2 has the ____ _____ of the slope of line #1. You can figure it out graphically. Hint: draw any line with a slope of 1/2. Then draw a perpendicular line. What's it's slope. What's the relationship?
Now you can use the 1st point and the massaged value of the slope to find the eqn.
s_cianci
Sep 22, 2007, 04:51 PM
You need to consider, in this order:
1. What is the slope of the line through (4 , -6) and (3 , - 4)?
2. What is the slope of any line perpendicular to that line?
3. Use your obtained slope from #2 and the given point (6 , -10) to write your equation.