Question

x - 2y = 4 2x - 6y = 8

Answer 1

x-2y=4
2x -6y=8   divide both sides by 2 and will get x-3y=4

x-2y=4
x-3y=4
----------- subtract the second from the first equation 
0 y = 0

x-2*0=4

x = 4

x=4
y=0 

hope helped