Question 31894
3X-Y=4 & XY=7 
Y=3X-4 OR X(3X-4)=7 OR 3X~2-4X-7=0 OR (3X-7)(X+1)=0 OR

3X-7=0 OR 3X=7 OR X=7/3 AND

X+1=0 OR X=-1 

SOLVING FOR Y WE GET 
3(7/3)-Y=4 OR 21/3-Y=4 OR 7-Y=4 OR 7-4=Y OR Y=3 X=7/3 & Y=-1 ALSO

3(-1)-Y=4 OR -3-Y=4 OR Y=-7 & X=-1 & Y=-7