Question 570138
x+y=9......1
y=2x.......2
or,y-2x=0...2
 x+y=9......1
-2x+y=0.....2
or,3x=9
or, x=3
substituting x in equation (1),
x+y=9
or,3+y=9
or,y=9-3=6
answers-:x=3
         y=6