anonymous
  • anonymous
Find the missing coordinate if A, B, and C are collinear. A = (2, 4), B = (0, 1), C = (-2, y)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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AkashdeepDeb
  • AkashdeepDeb
HINT: If they are collinear then they have the same slope. :)
ganeshie8
  • ganeshie8
or, use segment addition postulate
ganeshie8
  • ganeshie8
if A, B, C are collinear, then AB+BC = AC

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More answers

anonymous
  • anonymous
yes.
AkashdeepDeb
  • AkashdeepDeb
O use area theorem in co-ordinate geometry. :D
anonymous
  • anonymous
no idea what that is. sorry!! im only a freshman in high school!
ganeshie8
  • ganeshie8
which one u familiar wid ?
anonymous
  • anonymous
The segment addition.
ganeshie8
  • ganeshie8
that wont be easy here as it gives us quadratic
ganeshie8
  • ganeshie8
quadratic may not be easy to deal wid
AkashdeepDeb
  • AkashdeepDeb
@hannahbonana Do you know how to find slope? :)
anonymous
  • anonymous
yes. y=mx+b
AkashdeepDeb
  • AkashdeepDeb
RISE/RUN? :D
anonymous
  • anonymous
yes!! y2-y1/x2-x1:)
AkashdeepDeb
  • AkashdeepDeb
Excellent!! :D Now use that to find the slope from the 2 COMPLETELY GIVEN POINTS!! :D
anonymous
  • anonymous
ok!! so that would be -3/-2! s0 3/2
AkashdeepDeb
  • AkashdeepDeb
Yes so m = 3/2 now take any two points B = (0, 1), C = (-2, y) Now even these will have the same slope!! :D Find BC slope and equate it to 3/2!! :D Understood? :)
anonymous
  • anonymous
uh...you just lost meeee
AkashdeepDeb
  • AkashdeepDeb
Cna you find the slope of point BC ?
anonymous
  • anonymous
it would be y-1/-2
AkashdeepDeb
  • AkashdeepDeb
Or 1-y/2 Now they are collinear right? So the same line has the same slope!! :D 1-y/2 = 3/2 Understood? :)
AkashdeepDeb
  • AkashdeepDeb
|dw:1378577471248:dw|
anonymous
  • anonymous
yes..sort of. so that would be..Y=2!!
AkashdeepDeb
  • AkashdeepDeb
-2 ? :)
anonymous
  • anonymous
yes! -y=2 so yes.
AkashdeepDeb
  • AkashdeepDeb
Understood it? :)
anonymous
  • anonymous
YES. THANKS!!!!!
AkashdeepDeb
  • AkashdeepDeb
:)
anonymous
  • anonymous
;D

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