What are inequalities? They are just like equations, except that instead of an equals sign, we have one of these signs: less than, greater than, less than or equal, or greater than or equal.
Inequalities usually have lots of solutions so it's not practical to list them. I show how to PLOT the solution set of an inequality on the number line.
Then I talk about WHY we are allowed to add the same number to both sides of an inequality, or subtract the same number from both sides of an inequality, and it still holds true.
Lastly we solve some simple linear inequalities by adding or subtracting. The 2nd part of this lesson deals with inequalities where we multiply or divide the inequality by the same (positive) number.
Tagged under: inequality,7th grade,math,pre-algebra,plot inequality,number line
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