Find a Mathematical Model Representing the Statement $( y = 7 \text { when } x = 5 . )$

Multiple Choice

Find a mathematical model representing the statement.(Determine the constant of proportionality.)
Y is inversely proportional to x. $( y = 7 \text { when } x = 5 . )$

A) $y = \frac { 5 } { x }$
B) $y = \frac { x } { 35 }$
C) $y = 35 x$
D) $y = \frac { 35 } { x }$
E) $y = \frac { 7 } { x }$