Question 1203382
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Check out example 7.3.2 on this page
<a href="https://math.libretexts.org/Bookshelves/Algebra/College_Algebra_1e_(OpenStax)/07%3A_Systems_of_Equations_and_Inequalities/703%3A_Systems_of_Linear_Equations_with_Three_Variables">https://math.libretexts.org/Bookshelves/Algebra/College_Algebra_1e_(OpenStax)/07%3A_Systems_of_Equations_and_Inequalities/703%3A_Systems_of_Linear_Equations_with_Three_Variables</a>
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