Question 33599
-X+6Y=7 OR -X=7-6Y OR X=6Y-7 SUBSTITUTING (6Y-7) FOR X IN THE FIRST EQUATION WE GET 3(6Y-7)-2Y=11 OR 18Y-21-2Y=11 OR 16Y=32 OR Y=32/16 OR Y=2 THEN
X=6*2-7 OR X=12-7 OR X=5
PROOF 3*5-2*2-11 OR 15-4=11 OR 11=11 &
-5+6*2=7 OR -5+12=7 OR 7=7