Perpendicular lines have slopes that are opposite reciprocals of each other where the y-intercept does not make a difference true/false

Fred has a total of 62 dvd and cd. if the number of cd is three more than two times the number of dvd, how many cd does he have?

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?