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x - 12y = 1
-4x - 9y = 15
x = 1 + 12y
-4(1+12y) - 9y = 15
-4 -48y - 9y = 15
-57y = 19
y = (-⅓)
x = 1 + 12(-⅓)
x = 1 - 4
x = -3
Por tanto (x,y) = (-3,-⅓)
B.
x + 6y = 3
-9x + 2y = -83
x = 3 - 6y
-9(3-6y) + 2y = -83
-27 + 54y + 2y = -83
56y = -56
y = -1
x = 3-6(-1)
x = 3+6
x = 9
Por tanto (x,y) = (-1,9)