Mathematics

Problem

Area of the parallelogram formed by the lines

y = mx

y = mx + 1

y = nx

and

y = nx + 1

equals (A)

\frac{|m+n|}{(m-n)^2}

(B)

\frac{2}{|m+n|}

(C)

\frac{1}{|m+n|}

(D)

\frac{1}{|m-n|}