Question

Determine whether statement (3) follows statements (1) and (2) by the Law of Detachment or Law of Syllogism. If the conclusion is invalid, write invalid and explain why it is invalid.

(1) If two lines form four right angles, then they are perpendicular.
(2) If two lines are perpendicular, then they have opposite and reciprocal slopes.
(3) If two lines form four right angles, then they have opposite and reciprocal slopes.