Question 624841
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
using Substitution to find the solution for the System:
couple of Exs:
1:a= {{{highlight(5-2b)}}} **     
 5a+2b=1,   5({{{highlight(5-2b)}}}) + 2b = 1 
            25-10b+2b=1   
             -8b = -24  
               b = 3 and a = -1    ||**{{{a = 5-2*3 = -1}}}
 5: a-2b=9  'or'  a = {{{highlight(2b+9)}}} **  
 2a+3b=4,  2({{{highlight(2b+9)}}}) + 3b = 4  
                   4b +18 +3b = 4  
                        7b = -14  
                         b = 2   and a = 13   |||**{{{a = 2*2 + 9}}}