Answer:
Step-by-step explanation:
1) [tex]r \parallel s[/tex] (given)
2) [tex]\angle 2[/tex] and [tex]\angle 4[/tex] are supplementary (angles that form a linear pair are supplementary)
3) [tex]\angle 4 \cong \angle 8[/tex] (corresponding angles theorem)
4) [tex]\angle 2[/tex] and [tex]\angle 8[/tex] are supplementary (substitution)
