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Homework Statement
Prove that vectors [tex]\vec{u}[/tex], [tex]\vec{v}[/tex]and [tex]\vec{w}[/tex] are coplanar if and only if vectors [tex]\vec{u}[/tex], [tex]\vec{v}[/tex]and [tex]\vec{w}[/tex]are linearly dependent
Homework Equations
The Attempt at a Solution
This may sound like an awkward question, but I am having much difficulty proving this. I tried to multiply each vector by a scalar, but got stuck, below is my solution, up until I got stuck.Any help is much appreciated!
We need to write [tex]\vec{u}[/tex]= c1 [tex]\vec{v}[/tex]+ c2 [tex]\vec{w}[/tex]as:
[x1, y1, z1] = c1 [x2, y2, z2] + c2 [x3,y3, z3]
[x1, y1, z1] = [c1 x2, c1 y2, c1 z2] + [c2 x3, c2 y3, c2 z3]
x1 = c1 x2 + c2 x3
y1 = c1 y2 + c2 y3
z1 = c1 z2 + c2 z3
This is where I got stuck, and I am not sure what to do next.
Thanks,