How do you solve #-4t> -20#?
t < 5
To solve this inequation divide both sides by (- 4 ).
However , in doing this the inequality sign must be reversed. The same would be true if multiplying by a negative number.
# (-4t)/-4 < -20/-4 rArr t < 5 #
Example : - 1 < 2 : multiply both sides by (- 1 ) gives
1 < - 2 : Which is clearly incorrect and is the reason for reversal.
ie 1 > - 2