1.1.1 Describe geometrically (line, plane, or all of R^3) all linear combinations of

Problem 1.1.1 From Gilbert Strang's Introduction to Linear Algebra fourth edition. Chapter 1 - introduction to vectors - vectors and linear combinations.
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Describe geometrically (line, plane, or all of R^3) all linear combinations of
a) (1,2,3) and (3,6,9)
b) (1,0,0) and (0,2,3)
c) (2,0,0) and (0,2,2) and (2,2,3)

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