Answer:
Insert the point (-2, 3)
2·a·(-2) - b·3 - 5 = 0 --> - 4·a - 3·b - 5 = 0 --> 8·a + 6·b + 10 = 0
b·(-2) + 3·a·3 - 15 = 0 --> 9·a - 2·b - 15 = 0 --> 27·a - 6·b - 45 = 0
I + II
35·a - 35 = 0 --> a = 1
8·1 + 6·b + 10 = 0 --> b = -3
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