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We can find a parametric representation for the 3-dimensional straight line AB where

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

let t be 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

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

let t be 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