Asked by Tabby

How do I solve inequalities? For example a+15>27. a.) a>42 b.) a>13 c.) a>12 d.) not given.
Answered by drwls
You can add or subtract numbers or variables from both sides of inequalities and they remain valid. You can also multiply or divide either side by positive numbers. The direction of the inequality sign witll not change. If you multiply or divide both sides by negative numbers, the direction of the inequality sign must then change.

Example:
a + 15 > 27
Subtract 15 from both sides:
a > 12 is the answer. That is answer (c)
Answered by Tabby
OK I understand that, but what do you do if it's something like
8y - 21 < 7y + 3?
Answered by Damon
add 21 to both sides
8 y < 7 y + 24
subtract 7 y from both sides
y < 24
Answered by Tabby
Ok I can do that, but this question is different.
7y + 13 < 9y - 8
Ok I added 8 to both sides and got
7y + 21 < 9y
Then I subtracted 7y from both sides
21 < 2y
Now I'm stuck
Answered by brycen
divide both sides by 2
Answered by Damon
divide both sides by 2
10.5 <y
so y >10.5
is the more common way to write that
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