[tex] J(t)=12-\frac{2}{3}t=\frac{36}{3}-\frac{2}{3}t=\frac{36-2t}{3}\\
Y(t)=3-\frac{1}{8}t=\frac{24}{8}-\frac{t}{8}=\frac{24-t}{8}\\
J(t):Y(t)=\frac{J(t)}{Y(t)}=\frac{\frac{36-2t}{3}}{\frac{24-t}{8}}=\frac{36-2t}{3}*\frac{8}{24-t}=\frac{288-16t}{72-3t} [/tex]
