Me answer this equation i don't get it at all. -x-12y=11,7x+4y=3

-x-12y=11,7x+4y=3 would be better if written as

 -x-12y=11
7x+4y=3             Trick:  Mult the first equation by 7, so you'll have -7x there                                   and +7x in the 2nd equation.  Thus, you can eliminate x 
                           and focus on finding y.

-7x - 84y = 77
 7x + 4y   = 3

     -80y = 80, and so y = -1.    Use either of the given equations and y= -1 to determine the value of x.

x = ?
y = -1

Solution has the form (x, -1).