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x + y = 23
x - y = 3
(1 1) (x) = (23)
(1 -1)(y) (3)
jawaban C
no 10)
A = (-1 -3)
(-2 1)
2A = (-2 -6)
(-4 2)
B = (3 0)
(1 4)
(2A + B) X = C
(-2 -6)+(3 0) X = (3 -14)
(-4 2 ) (1 4) (-9 18)
(1 -6) X = (3 -14)
(-3 6) (-9 18)
X = 1/-12 (6 6)(3 -14)
(3 1)(-9 18)
= (-1/2 -1/2) (3 -14)
( -1/4 -1/12)(-9 18)
= (-3/2 + 9/2 7 -9)
(-3/4 +3/4 14/4 - 18/12)
= (3 -2)
(0 2)
jawaban E