1. ## Equivalence

Which two equations are equivalent?

lxl = -5

x = 5

lxl = 5

x = l5l

2. ## Re: Equivalence

Originally Posted by thamathkid1729
Which two equations are equivalent?

lxl = -5

x = 5

lxl = 5

x = l5l
first equation is always false ... $|x| \ge 0$ for all real $x$

so, that leaves you three equations to think about.

3. ## Re: Equivalence

so it must be the 2nd and the 4th!

4. ## Re: Equivalence

Originally Posted by thamathkid1729
so it must be the 2nd and the 4th!
Yeah, that's right!