Answer:
Step-by-step explanation:
1. m∠6 = m∠8, b║c
Given
2. m∠7 = m∠8
It is given that b and c are parallel therefore, ∠7 and ∠8 are the corresponding angles.
3. m∠6 = m∠7
Since ∠6 = ∠8 and ∠7 = ∠8
Therefore, ∠6 = ∠7
Substitution
4. a║b
Since ∠6 = ∠7 (alternate interior angles) so lines a and b will be parallel.