Optional extension The quantity $y$ varies directly with $T$ and inversely with $x^2$. Given \

Question

Optional extension The quantity $y$ varies directly with $T$ and inversely with $x^2$. Given $y=5$ when $T=4,x=2$:

Accepted Answer

(a) $y=\dfrac{5T}{x^2}$ (b) $y=1.2$.

Direct-inverse combined formula