Question

How do you solve `-4t> -20`?

Answer 1

t < 5

Explanation:

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