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2x +3y= -1 (1)
7x -2y = 9 (2)
Despejas x en (1) y (2)
2x +3y= -1 =
X =( - 3y-1)/2
7x -2y = 9=
X=(9+2y) /7
Igualamos
X=X
(-3y - 1)/2 = (9+2y)/7
7(-3y-1)= 2(9+2y)
-21y - 7 = 18 +4y
-7 - 18 = 4y +21y
-25 = 25y
Y = - 25/25
Y = - 1
Reemplazas y en
X =( - 3y-1)/2
X = (-3(-1) - 1) /2
X = (3 - 1) /2
X = 2/2
x = 1