if l&m are intersecting lines,p parallel to l and q parallel to m,show that p and q intersect.2mark

let slope of l be m1 and slope of m be m2.

since l and m intersect i.e. m1 is not equal to m2.

now p || l ==>m_p = m1 

and q || m ==>m_q =  m2

since m_p is not equal to m_q which implies p and q will also intersect each other.