Finding help for elementary linear algebra is quite simple, one can find such helpful text books on the subject in question in a local Library. Also if you have a basic computer skills you may be able to search a few websites that may give you an introduction to elementary linear algebra.
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The answer depends very much on your aptitude, and possibly your interest: there are no absolutes. Some people find calculus easy but not linear algebra and others are the opposite.
Algebra exists to find solutions
how do we find linear feet or inche
Algebra
k is often a constant. We don't know what the constant is, but we know we could find out.