dy Solve the given initial-value problem. The DE is of the form = f(Ax+By+ C). dx dy dx 9x + 2y 9x + 2y + 2 y(-1) = -1

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Q: . Let a, b € Z so that 4a + 5b is a multiple of 13. Prove that 13 divides 9a + 8b.

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