Directly and Inversly Proportional
Source:
February 1, 2009
Problem Statement
Indicate in which one of the following equations is neither directly nor inversely proportional to :
(A)\ x \plus{} y \equal{} 0 \qquad(B)\ 3xy \equal{} 10 \qquad(C)\ x \equal{} 5y \qquad(D)\ 3x \plus{} y \equal{} 10
(E)\ \frac {x}{y} \equal{} \sqrt {3}