Answer:
x=3 and y=6
Explanation:
Substitute: y=2x in place of Y in the first equation we will put 2x
x+2x= 9
1x+2x=9
3x=9
divide both sides by 3
x=3
Now go to either of the original equations and substitute the answer you got for x which is 3 to find y
y=2x so 2 times 3 = so y =6