12.5: Equations of Lines & Planes (1/2)

Objectives:
24. Write the parametric and symmetric forms of the equation of a line.
25. Define the normal vector to a plane.
26. Find the equation of a plane in three-space.
27. Determine when two planes are parallel.

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[rgdjtey]

for the z value for the vector at 16:47, shouldnt it have been 8 instead of -8?

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[gf]

You shouldnt have used "little a" vector along the line. It confuses with <a, b, c> the direction cosines.

[KINGDOY]

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[vywvyyj]

in 12:10 why we chose second one p2(5, 0, 7) used in r=x0 +t(vector), please explain ? can we use in p1(2, 4, -1) use in x0 point