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a + 3b =-9 +6
a + 3b = -3 | : 3
1/3a + b = -1
1/3a + b - 2 = -3
bo :
1/3a + b - 2 = -3 | *3
1a + 3b - 6 = -9
5a + 15b - 30
1a + 3b - 6 = -9 | *5
5a + 15b - 30 = -45 | :5
a + 3b - 6 = -9
chyba o to chodziło ;)
a więc
1/3 a + b = 2 => b=2 - 1/3 a
5a + 15(2 - 1/3 a) = 31
5a+30-5a = 31
brak rozwiązania dla tego układu