Question

write as a flow proof.
if two lines and a transversal form supplementary same-side interior angles, then the two lines are parallel.
given: <1 and <2 are supplementary
prove: l is parallel to m
proof: it is given that <1 and <2 are supplementary, <1 and <3 are also supplementary, so <2=<3. since <2 and <3 are corresponding angles l is parallel to m