19)
6a + 2b = 12. x 2
-5a + 4b = - 27
12a + 4b = 24
-5a + 4b = -27
17a = 51
a = 3
18 + 2b = 12
2b = -6
b = - 3
jawaban D
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19)
6a + 2b = 12. x 2
-5a + 4b = - 27
12a + 4b = 24
-5a + 4b = -27
17a = 51
a = 3
18 + 2b = 12
2b = -6
b = - 3
jawaban D