Introduction to Linear Algebra, Gilbert Strang, 2016 (Wellesley-Cambridge Press) - A widely recognized textbook covering fundamental linear algebra concepts, including systems of linear equations and the definition of a solution.
Linear Algebra and Its Applications, David C. Lay, Steven R. Lay, and Judi J. McDonald, 2021 (Pearson) - A standard textbook that clearly explains how to represent and understand solutions to systems of linear equations in matrix form.
Linear Algebra (MIT 18.06SC), Gilbert Strang, 2011 (Massachusetts Institute of Technology) - Provides lecture videos and notes from a comprehensive online course, offering detailed explanations and geometric interpretations of linear systems and their solutions.