line 1...6x+2y=-19 or 12x+4y=-38
line 2...5x+4y=+17
line 2 - line 1...(5x -12x) +(4y -4y)=+38...become -7x=+38
or x=-38/7...-5.42857142857142...
from line 1, 2y=-6x-19=-6*(-38/7) -19...=+(228/7)-19...32.57142857 -19...=+13.57142857
thus, y=13.571428/2...y=6.785714285714...