Suppose the point (x,y)\displaystyle {\left({x},{y}\right)} is in quadrant IV. Decide whether the following ratio are positive or negative.

 yr\displaystyle \frac{{y}}{{r}} =

xr\displaystyle \frac{{x}}{{r}} =

yx\displaystyle \frac{{y}}{{x}} =

ry\displaystyle \frac{{r}}{{y}} =

rx\displaystyle \frac{{r}}{{x}} =

xy\displaystyle \frac{{x}}{{y}} =