Question 37403
X=2Y+2  SUB (2Y+2) FOR X IN EQUATION #2 WE GET 

2(2Y+2)+3Y=11 OR 4Y+4+3Y=11 OR 7Y=7 OR Y=7/7 OR Y=1

THEN X=2Y+2 OR X=2*1+2 OR X=4 

PROOF 2*4+3*1=11 OR 8+3=11 OR 11=11 & 4-2*1=2 OR 4-2=2 OR 2=2