Question 1172803
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Hi  
x-2y=3
x+y=2(y+3)  0r  x - y = 6

x-2y=3
x- y= 6  

-x+2y=-3  |Multiplying 1st EQ thru by -1 to eliminate x
 x- y= 6 
  y = 3  and x = {{{2y + 3}}} , x = 9
(9,3) the solution to linear system
CHECKING our answer***
{{{x+y=2(y+3)}}}
  12 = 12 Checks!
Wish You the Best in your Studies.
Graphing y = x - 6 Green and y = x/2 - 3/2  Blue
Lines meet at P(9,3)
{{{drawing(300,300,    -10,10,-10,10, 
 grid(1),
graph( 300, 300, -10,10,-10,10,0, x-6,(x/2)-(3/2)) )}}}