Algebra 1 questions, help please

We have to solve the following systems of equations for x and y (we have to try and find the ''solution'' of the equations)

y=x/2+1
2y=x-2 --> i simplified to y=x/2-1 ( i think its right)

then ur supposed to do x/2+1=x/2-1 , i think to find x.
i have no idea how to solve that >.<

plus i do not understand these either:

y+x/2=1
y+6x=3




y-x=2/7
3y+x=2/3


and


3x=3y-1
3x=y+2


thank u so much >.<
i took algebra last year and i dont remember anything because of the horrible teacher i had! :(

1﹑Yes you can't solve x from these 2 equations so I've no idea either

2﹑simplify it to 1-x/2=3-6x,so x=4/11,y=9/11
3﹑add these 2 equations together and get 4y=20/21,so y=5/21,x=-1/21
4﹑3y-1=y+2,so y=3/2,x=7/6

Hope it helps :)