Why does the inequality sign change when both sides ar multiplied or divided by a negative number?
write down any true inequality
e.g.
8 > 2
now divide it by -2
-4 > -1 , this is false, how do we make it true?
back to 8 > 2, true!
multiply by -5
-40 > -10 , FALSE !
How do you make it true ?