- #1
hagobarcos
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Homework Statement
Find an equation of the plane that passes through the points (4,2,1) and (-2, 9, 6), and is parallel to the z axis.
Homework Equations
a(X-Xo) + b(Y-Yo) + c(Z-Zo) = 0
The Attempt at a Solution
Okay so for this one, I first tried to make a vector out of the two given points.
If P(4,2,1) and Q(-2,9,6),
then PQ = <-6,7,5>.
Next I fumbled around a bit trying to figure out how to either a) find another vector to form a cross product with, or b) somehow figure out what the <a,b,c> numbers should look like in order to be parallel to z axis.
When I tried approach a) I came up with another point on the z axis, (0,0,1), used it as a vector of its own, crossed it with PQ, picked up the resultant, and plugged in the direction numbers to the plane equation.
For part b) I tried making a vector out of (0,0,1) and P, crossing it with PQ and using the resultant direction numbers.
However, both approaches seem to be rather wrong.