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find the equation of a line given the paired points (-7, -6) (-2, -4)

 Feb 10, 2015

Best Answer 

 #1
avatar+1975 
+10

Put the points in slope form

m = (-4) - (-6)/(-2) - (-7)

Solve

m = 2/5

Now put the numbers in slope-intercept form, and pick one point (im doing (-2, -4))

-4 = 2/5(-2) + b

Multiply

-4 = -4/5 + b

add on both sides

-3 1/5 = b

Now plug m and b into the eqation again

y = 2/5x - 3 1/5

 Feb 10, 2015
 #1
avatar+1975 
+10
Best Answer

Put the points in slope form

m = (-4) - (-6)/(-2) - (-7)

Solve

m = 2/5

Now put the numbers in slope-intercept form, and pick one point (im doing (-2, -4))

-4 = 2/5(-2) + b

Multiply

-4 = -4/5 + b

add on both sides

-3 1/5 = b

Now plug m and b into the eqation again

y = 2/5x - 3 1/5

saseflower Feb 10, 2015
 #2
avatar+128707 
0

That's an interesting technique, saseflower.....I don't think I've seen it done that way before.....very nice....!!!!

 

 Feb 10, 2015
 #3
avatar+1975 
+5

Really? That's the only way I know how to solve those type of questions, how did you learn to do it?

 Feb 10, 2015
 #4
avatar+128707 
0

Don't worry about it....I checked both of the points in your equation and it was all good....in fact, I kind of like your way better than the way I learned it...LOL!!!

 

 Feb 10, 2015

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