For each of the following pairs of values $(x,y)$ with $x$ in $\mathbb{Z}_{35}$ and $y$ in $\mathbb{Z}_{49}$, determine the number of group homomorphisms

$g: \mathbb{Z}_{35} \rightarrow \mathbb{Z}_{49}$

with $g(x) = y$. If there is none, enter 0.

$(x,y)$	number of homomorphisms
$(10, 15)$
$(45, 28)$
$(21, 10)$
$(7, 21)$