Find the Slope of the Line Determined by This Pair $- \frac { m } { n }$

Multiple Choice

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

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