Question: Let (a,b) and (c,d) be two vectors in R^2. If ad?bc=0, show that they are linearly dependent. If ad?bc ? 0, show that they are

Let (a,b) and (c,d) be two vectors in R^2. If ad?bc=0, show that they are linearly dependent. If ad?bc ? 0, show that they are linearly independent.

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