please answer my all questions
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1) 1/2( X1(y2-y3) + X2(y3-y1)+x3(y1-y2)
= 1/2 (1(-1-5) +4(5-2)+-2(2+1)
= 1/2(-12+12)
= 0
hence proved that the pts are collinear
bcz the collinear are those pts which do not make triangles so on finding the area of triangle the area we get is 0 which simply gives us result that these are collinear pts
2) these are parallel lines
X+2y=o
on finding its slope we get (-1/2)
and also on finding the slope of second equation the slope also come(-1/2)
as we know the parallel lines have the same slope so these are parallel lines
3)as the relation between the slope of two perpendicular lines are (m1=1/-m2)
so from this relation u will get the 'a'
-2/3=-1/-3)a
a=-2
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