Let L be the set of all lines in the XY plane. Define the relations R1 and R2 as follows:
R1={(ℓ1,ℓ2)∣ℓ1,ℓ2∈L and ℓ1 is parallel to ℓ2}R2={(ℓ1,ℓ2)∣ℓ1,ℓ2∈L and ℓ1 is perpendicular to ℓ2}
Use this information to answer the given subquestions.
