For all positive integers a, b, c and d,
if gcd and c | ab, then c = d.
Need help proving this question, I know that abx + cy = d for integers x,y
and that c|ab can be c=q\cdot ab but I'm not sure how to apply these facts or if they're even useful in this proof.
Any help to get me started would be great.
Answer
c|ab means that ab=q\cdot c, not the other way around!
Therefore, you have ab=q\cdot c and ab x + c y = d which you can rewrite into qcx + cy = d\\ c(qx+y) = d
Can you continue from here?
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