using the point-slope form of the line: y - y_1 = m(x - x_1) to find the equation of the line passing through the points (5, -3) and (-1, 5)

- Sep 18th 2009, 09:05 PMtyonnacan anyone qive me the answer and explain how to work this question for future ref.
using the point-slope form of the line: y - y_1 = m(x - x_1) to find the equation of the line passing through the points (5, -3) and (-1, 5)

- Sep 18th 2009, 09:18 PMChris L T521
- Sep 18th 2009, 09:32 PMtyonna
- Sep 18th 2009, 11:49 PMmr fantastic
- Sep 19th 2009, 12:57 AMCaptainBlack
See the PurpleMath article, you need the second worked example.

CB - Sep 19th 2009, 05:24 AMViral
Oooh, I'd like to answer this as we just learned it yesterday :) .

To get the equation of a line passing through two points, you need to know how to work out the gradient:

or:

So to work that out with your question:

So you now have the gradient, . Now choose one of the coordinates, I'll use .

I've checked that against both of your coordinates and it works, so look over those notes and you should be able to understand it :) .