if the points (7,a) (-5,2) and (3,6) are collinear,find a.
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Answered by
30
If the points are collinear then ;
x1 (y2-y3) +x2 (y3-y1) +x3 (y1-y2)=0
7 (2-6) + (-5) (6-a) + 3 (a-2)=0
by solving, a =8
x1 (y2-y3) +x2 (y3-y1) +x3 (y1-y2)=0
7 (2-6) + (-5) (6-a) + 3 (a-2)=0
by solving, a =8
kvnmurty:
missing RHS: = 0 for the equation...
thanx for correcting me ^_^
Answered by
23
A (7, a) ; B (-5, 2) ; C(3,6)
Slope of AB = Slope of BC
(a - 2)/(7 - (-5)) = (2 - 6) / (-5 -3)
(a - 2) /12 = 1/2
a = 8
Slope of AB = Slope of BC
(a - 2)/(7 - (-5)) = (2 - 6) / (-5 -3)
(a - 2) /12 = 1/2
a = 8
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