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    • 1.9.9: Solving a System of Linear Equations Using the Elimination Method
      https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Physics_II_(2212)/01%3A_Introduction_to_Physics_Measurements_and_Mathematics_Tools/1.09%3A_Math_Review_of_Other_Topics/1.9.09%3A_Solving_a_System_of_Linear_Equations_Using_the_Elimination_Method
      So if you have a system:  x−y=−6 and  x+y=8, you can add  x+y to the left side of the first equation and add 8 to the right side of the equation. You can multiply both sides of one of t...So if you have a system:  x−y=−6 and  x+y=8, you can add  x+y to the left side of the first equation and add 8 to the right side of the equation. You can multiply both sides of one of the equations by a number that will result in the coefficient of one of the variables being the opposite of the same variable in the other equation.

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