I need help on this problem.

Use slopes to show that the points A (-1,-5), B (1,-1), and C (3,3) are collinear, that is, they lie on the same line

Question

I need help on this problem.

Use slopes to show that the points A (-1,-5), B (1,-1), and C (3,3) are collinear, that is, they lie on the same line

nottim · Answer

Y not graph it, find slope, and plug that into y=mx+b

nottim · Answer

ello

anonymous · Answer

i think u must get the same equation for the line

anonymous · Answer

i does not matter if u use the points A and B 
or A and C

e.mccormick · Answer

Actually, you need to make sure to use all the points when doing it by slope method.  So you make two lines, one with two points, one with the other point and one used in the first equation.  If they share a point and have the same slope, they are the same line.

anonymous · Answer

Oh ok

anonymous · Answer

That's what I originally thought, but I wasn't completely sure about it

e.mccormick · Answer

Well, there you go!  Confirmation!  Hehe.  You were on the right path.  And that is good.

anonymous · Answer

I just found the slope of AB, AC, and BC and they all had a slope of 2, so this means that they are all on the same line

e.mccormick · Answer

Yep!  And if you needed it written as a proof, that is not that much more.