Question 911299
From eq. 1,
{{{x=4y+4}}}
Substituting,
{{{-4y-4+4y=-4}}}
{{{-4=-4}}}
True for all x.
This is a dependent system. 
If you multiply equation 1 by {{{-1}}} you get equation 2.
Any solution of equation 1 is a solution of equation 2, infinitely many solutions.