Lial, M.L., Hungerford, T.W., Holcomb, J.P., & Mullins, B. (2023). Finite Mathematics with Applications In the Management, Natural, and Social Sciences (13th ed.). Pearson Education.
Read the following chapter sections: 6.1, 6.2, and 6.3
Michel van Biezen. (2012, Dec 20). Algebra - Solving Linear Equations by using the Graphing Method 1/2 [Video]. YouTube. https://www.youtube.com/watch?v=CmAMZ_61JSQ
Watch this video on how to solve systems of linear equations by graphing.
Mathispower4u. (2014, Jul 10). Ex: Solve Systems of Linear Equations Using Substitution (Mixed Review - All Types) [Video]. YouTube. https://www.youtube.com/watch?v=7qGWELgB-XE
This video provides 4 examples of how to solve a system of linear equations using the substitution method. All three possibilities are shown: one solution, no solution, and infinite solutions.