From the equations which represents the following Pair of lines. ,
y = mx , y = nx

Explanation

y - mx = 0 , y = nx = 0
or , (y-mx)(y-nx)= 0
or, `y^2 - nxy - mxy + mnx^2 = 0`
or, y^2 - xy(m+n) + mnx^2` = 0