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Homework Statement
Suppose that gcd(a, b) = 1 with a, b > 0, and let x0, y0 be any integer solution to the equation ax + by = c. Find a necessary and sufficient condition, possibly depending on a, b, c, x0, y0 that the equation have a solution with x > 0 and y > 0.
Homework Equations
The Attempt at a Solution
I'm pretty lost. Can anyone point me in the right direction?