Step-by-step explanation:
Using Substition method
x=4-y
(4-y)+2y=6
4-y+2y=6
-y+2y=6-4
y=2
input the value y=2 into x=4-y
x=4-2
x=2
To check if you are right
Since x=2 and y=2
x+y=4
2+2=4
x+2y=6
2+(2×2)=6
