<PRE><B>Question 214189</B>
How do you solve by substitution of linear equation?

  {{{2x+y=9}}}

  {{{y=x-3}}}


The following steps solves the equation by substitution.


*[invoke linear_substitution &quot;x&quot;, &quot;y&quot;, 2, 1,9,-1,1,-3 ]


The solution is x=4  and y =1 or the point (4,1)


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>