help!!
which equation represents the line passing through the points (3,2) and (-9,6)

Question

help!!
which equation represents the line passing through the points  (3,2) and (-9,6)

e.mccormick · Answer

Have you tried finding the slope then using point slope to find the line?

anonymous · Answer

yea i got 3x+y=9

ryan123345 · Answer

First find the slope.

anonymous · Answer

how do u do tht
?

e.mccormick · Answer

How did you get 3x?  Look at your slope formula:$$m=\frac{y_1-y_2}{x_1-x_2}$$

e.mccormick · Answer

AKA rise over run or change in y over change in x.

anonymous · Answer

oh so should the 9 be -?

e.mccormick · Answer

Well, whatever it is, you subtract it.  So if it is negative, it gets added.  $a - (-b)=a+b$

e.mccormick · Answer

Here is another interesting fact.  It does not matter which you choose as $(x_1,y_1)$ and $(x_2,y_2)$.  For example: $$\frac{2-6}{3-(-9)}~\mathrm{and}~\frac{6-2}{(-9)-3}$$both give the same answer.
Once you solve the slope properly, put it into a point-slope formula.  Then you can get the answer.