Question about substitution and elimination problem?

[Rosa Luciano]

2/3y-6=-1/2x
1/2y-3x/4=0

how would i do substitution for this problem

2x+2y-8=0
2x+1=y

i have y=2x+1

so can x=0 and y=1 I'm very confuse .

What about elimination method for y-3x=-2
2y-6x=4

Can x=-4 than y=-4??