Question 1019854
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Hi  

(1) 3x - y = 9
(2) 3y + 11 = 5x
 Using the substitution method:
y = 3x-9   {{{3x - y = 9}}}
3(3x-9) + 11 = 5x  {{{3y + 11 = 5x}}}
9x - 27 + 11 = 5x
4x =  27-11
4x = 16
x = 4 , y = 3  {{{y = 3*4-9}}}

Checking our Work!
 {{{3y + 11 = 5x}}}
3*3 + 11 = 5*4
      20 = 20