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a + b + c = 30
b - a = 4
b - c = 2
(1 1 1) (a) = (30)
(-1 1 0) (b) (4)
(0 1 -1) (c) (2)
jawaban E
no 5)
3x - 2y = -12
4x + y = -5
(3 -2)(x) = (-12)
(4 1)(y) (-5)
jawaban D
no 6)
3x + 2y = 24 kalikan 4 12x + 8y = 96
4x + y = 27 kalikan 3 12x + 3y = 81
------------------- -
5y = 15
y = 3
jawaban B