Question

which one is true if ax+by=18

Answer 1

a)(a,b)\18
b)(x,y)=18
c)(x,y)\18
d) a and c

Answer 2

Hint :

If \(d\) is the \(\gcd\) of \(a,b\),
then \(d\) is the "least positive integer" that can be expressed as \(ax+by\) for some integers \(x,y\).

Answer 3

so you mean that true answer is a.

Answer 4

could you take a screenshot of options and attach ?