<PRE><B>Question 213996</B>
Please help me solve the substitution  x+y=12 and x-y=-4. I can&#39;t figure out how to solve these.


{{{x+y=12}}}
{{{x-y=-4}}}


The following will solve the system of linear equations by substitution.


*[invoke linear_substitution &quot;x&quot;, &quot;y&quot;, 1,1,12,1,-1,4]


I hope the above steps were helpful. 


For free Step-By-Step Videos on Introduction to Algebra, please visit http://www.FreedomUniversity.TV/courses/IntroAlgebra or for Trigonometry visit http://www.FreedomUniversity.TV/courses/Trigonometry.


And good luck in your studies!


Respectfully,
Dr J</PRE>