Question

Select the contrapositive of the conditional statement:
“If lines are perpendicular, then they meet to form right angles.”
A. If lines are not perpendicular, then they do not meet to form right angles.
B. If lines meet to form right angles, then the lines are perpendicular
C. If lines do not meet to form right angles, then the lines are not perpendicular.
D. Lines are perpendicular if and only if they meet to form right angles

Answer 1

Discrete Math, yay!
Implication is if p then q, so the contrapositive is: if (NOT)q then (NOT)p

Answer 2

Basically we negate the statement on both sides by stating the oposite.

Answer 3

The statement converts to: If lines are not perpendicular, then they do not meet to form right angles.

Answer 4

So the answer is A.

Answer 5

I see where you got that from @Ninjalobster

http://answers.yahoo.com/question/index?qid=20080812104125AASK5EV

Answer 6

from my head, I'm in Discrete Mathematics
The answer is C, sorry to say that you are incorrect

Answer 7

I can prove using a truth table, if you would like.

Answer 8

I'm pretty sure a contrapositive is just when you negate both sides.

Answer 9

You have stated the inverse, a contrapositive is equal to its implication