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## Answers

A(-7,6,3) & B(7,-6,3)

by taking parametric representation for the line AB

then consider T as a real valued parameter

x = x1 + (x2 - x1) t = -7 + 14 t

y = y1 + (y2 - y1) t = 6 -12 t

z = z1 + (z2 - z1) t = 3 - 6 t

-7i+6j -3k

and 7i -6j-3k

vector equation of the straight lines joining A(a) and B(b) is r = (1-t)a +tb

the equation of the line joining the points (-7,6,-3) and (7,-6,-3) is

r = (1-t)(-7i+6j -3k) + t(7i -6j-3k)