Question

CERTAIN ANSWERS ONLY!!! There should 4 answers, thank you in advance. It may be a bit difficult sorry. Thank you :)

Answer 1

Answer:

i can't understand sorry

Step-by-step explanation:

Answer 2

Answer:

See Below.

Step-by-step explanation:

We are given that ∠1 and ∠7 are supplementary.

And we would like to prove that a is parallel to b.

  Statements:                                           Reasons:

$\textbf{\textsf{1. \angle 1 and \angle 7 are supplementary}}$              Given

$\textsf{2. m\angle3 + m\angle 7 = 180 }$                               Supplementary Angles

$\textsf{3. \angle3 and \angle7 are supplementary}$                Definition of Supplementary

$\textsf{4. }\bf{\angle 1 \cong \angle3}$                                               Congruent Supplements Theorem

$\textsf{5. }a\parallel b$                                                      Corresponding Angles Converse

And we are done!