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teejmd
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Homework Statement
Any two vectors that are not parallel define a plane. So p = i + j -k and q = 2i +j define a plane. For what values of x is the vector r = xi + j + k in this plane?
Homework Equations
The Attempt at a Solution
If r* was in the plane formed by p* and q*, would r* be a scalar multiple of p* and q* to be certain it was in the plane? Solving that I get the only x value being 2. I'm not sure if this was the right approach and would appreciate some help! thanks