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

Answer:

x> 93

Step-by-step explanation:

x - 72 > 21.

Add 72 to each side

x - 72+72 > 21.+72

x> 93