Question

9. Solve x - 72 > 21.

Answer 1

Inequalities are just like regular equations with only one exception. Which is when yo multiply or divide by a negative number to both sides of the inequality sign you must flip it. But, for this inequality that rule will no apply. So, what I do to make it easier because I know we all see a different sign in an equation and we start to freak out. So, change the inequality sign to an equals sign to get a hang of working with them.

Example of changing an inequality sign to an equals sign:

`x-72=21`

`x-72+72=21+72` Addition property of equality

`x=93`

or

Example of keeping the inequality sign

`x-72>21`

`x-72+72>21+72` Addition property of equality

`x>93`

Answer 2

x> 93

Explanation:

x - 72 > 21.

Add 72 to each side

x - 72+72 > 21.+72

x> 93