Match the systems of equations with their system of linear equations x-y=25 2x+3y=180 2x-3y=-5 x+y/11=50 x-y=19 -2x+y/6=28 2x-y=-6 x-305/3=2y solutions (-31,-56) (51,26) (47,33) (-17,-36)

Had trouble reading your post.  It's important that you separate each equation with plenty of spaces, or, b etter yet, type only one equation per line:

x-y=19 -2x+y/6=28  should be:

   x-y=19
-2x+y/6=28  

Does (-31,-56) satisfy this system?  Is (-31) - (-52) = 19?  No.  Move on to the next system and check again whether or not (-31, -56) is a solution.