Find the Slope of the Line Determined by This Pair $( m , 0 ) , ( 0 , n )$

Multiple Choice

Find the slope of the line determined by this pair of points. $( m , 0 ) , ( 0 , n )$

A) $- \frac { n } { m }$
B) $\frac { m } { n }$
C) $- \frac { m } { n }$
D) $\frac { n } { m }$
E) undefined