Parallel lines p. q, and rare cut by transversal t. Which of these describes how to find the value of x?

1.Lines p and rare parallel, so the alternate

exterior angles are congruent; x = 130.

2.Lines p and r are parallel, so the alternate

exterior angles are supplementary; x = 50.

3.Lines q and r are parallel, so the

corresponding angles are congruent; x = 50.

4.Lines q and rare parallel, so the interior

angles are supplementary; x = 130.