An equation of direct variation is something like
[tex]y=kx[/tex]
If we have a value for x and y, we simply have to plug these values and see which constant k suits our case:
[tex]y=kx \implies -17=-10k \implies k = \dfrac{-17}{-10}=\dfrac{17}{10}[/tex]
So, the relation
[tex]y=\dfrac{17}{10}x[/tex]
is a relation of direct variation and it includes the point (-10,-17).
