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x - y = -4 (2)
de (2) despejamos x
x - y = -4
x = -4 +y (este valor lo remplazamos en (1)
3x +2y = 18
3( -4 +y) +2y = 18
-12 +3y +2y = 18
5y = 18 +12
5y = 30
y = 30/5
y = 6 ( remplazamos este valoe en (2)
x - y = -4
x -6 = -4
x = -4 +6
x = 2
solucion x = 2, y = 6