Posted by Jazz on Thursday, January 17, 2008 at 8:01pm.
I cannot remember how to find the slope of a line when you are given two points.
Here is the problem.
The slope of a line through (2,1) and (5,n) is 3. n=___
I ended up with 2. But I don't think that is the right answer. I put the points in slopeintercept form and solved for y, which would end up being n, right?
y(or n)=5x+3
y(1)=2x+3 [x equals 1 right?]
I'm so confused. . . .

Math  Reiny, Thursday, January 17, 2008 at 8:10pm
How would you find slope if you knew all of the two points
just set
(n1)/(52)=3
n1 = 9
n = 10
test is by finding the slope, it works

Math  Reiny, Thursday, January 17, 2008 at 8:15pm
the method you tried will work, but you made an error.
here is how it would have looked:
let y = mx + b, but we have a point (2,1) and m=3
1 = 3(2) + b
b = 5
so the equation is y = 3x  5
now sub in (5,n)
n = 3(5)  5
n = 10
much longer and more complicated, you must agree.
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