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Homework Statement
Determine whether set S = {2a,-4a+5b,4b| aε R ^ bε R} is a subspace of R3?
If it is a subspace of R3, find the dimension?
Homework Equations
dimension= n if it forms the basis of Rn, meaning that its linear independent and span(S) = V
The Attempt at a Solution
I am confused on really where to start on this problem.
What do I do with the a's and b's? I have only done problems like this with real values for the vectors. What is the first step in determining if this is a subspace?