#### Answer

(a) not proportional
(b) inversely proportional

#### Work Step by Step

(a) $y$ is not proportional to $x$ in the equation $y= \frac{3}{x+1}$ because it does not have the form $y=kx$ or $y=k/x$.
(b) $y$ is inversely proportional to $x$ in the equation $y= \frac{3}{x}$, since it has the form of $y=k/x$.