Answer:
x = 3, y=0
Explanation:
2x + y =6
y = x-3
Substitute the second equation into the first
2x +x-3 =6
Combine like terms
3x-3 =6
Add 3 to each side
3x-3+3 = 6+3
3x= 9
Divide each side by 3
3x/3 = 9/3
x =3
Now we need to find y
y = x-3
y = 3-3=0
y=0