SOLUTION: what is find the slope of the line containing the points (-2,1) and (5,8)

Question 354301: what is find the slope of the line containing the points (-2,1) and (5,8)
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Given 2 points example.
Find the equation of the line thru the points (2,1) and (3,5)
---------------------
This is a 2 step process. First find the slope of the line thru the points.
slope, m = diffy/diffx
m = (5-1)/(3-2)
m = 4
---------
Now use y = mx + b with either point to find b, the y-intercept.
y = mx + b
5 = 4*3 + b
b = -7
-------
y = mx + b
y = 4x - 7 is the answer.
------------------------
Another approach using determinants:
|x y 1|
|2 1 1| = 0
|3 5 1|
--------
x(1-5) - y(2-3) + 1(10-3) = 0
-4x + y + 7 = 0
y = 4x - 7
---------
For further assistance, or to check your work, email me via the thank you note
or at Moral Loophole@aol.com
RELATED QUESTIONS
what is the slope of a line containing points (2,-1) and (3,5) (answered by ankor@dixie-net.com,ikleyn)

find the slope, if it exists, of the line containing the points (-5, 1/2) and (-8,... (answered by oscargut)

What is the slope of the line containing the points (�7, 3) and (2,... (answered by Maths68)

find the slope of the line containing the following 2 points (3/8,-2) and... (answered by Alan3354)

find the slope of the line containing the pair of points: (8, 2) and (9,... (answered by jim_thompson5910,Adrish)

find the slope of a line containing a pair of points (3,1) and... (answered by mananth)

The slope of the line containing the points (5, 3) and (8, 10)... (answered by Maths68)

find the slope of the line containing the points: (4, -1), (5,... (answered by rfer)

What is the slope of line containing these points? (6,-8) and... (answered by rfer)

Find the slope of the line containing the two points: (2,1) and... (answered by josgarithmetic)