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Writing Equations with Inequalities: Open Sentences and True/False Statements Video

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  • 0:05 An Inequality
  • 1:00 The Four Inequalities
  • 2:10 True or False Statements
  • 3:16 Open Sentences
  • 3:42 Lesson Summary
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Lesson Transcript
Instructor: Yuanxin (Amy) Yang Alcocer

Amy has a master's degree in secondary education and has taught math at a public charter high school.

After watching this video lesson you will be able to write open sentences and true or false statements that use inequalities. You will also be able to solve and/or determine whether a particular inequality is true or false.

An Inequality

Picture two pie slices with one being bigger than another. We can use inequalities to tell us which is bigger. What exactly is an inequality? Think of it as comparing the sizes of two values. The word 'inequality' literally means not exactly equal. So when we are using inequalities, our two values may not be equal and it is our job to figure out which value is the larger one.

To help us do this, we have symbols we can use. And these symbols actually are very good at telling us which one is bigger. For example, to say that 2 is greater than 1, we use the greater than symbol ( > ) and write 2 > 1. You can remember this sign easily because it looks like a mouth that is opening towards the bigger number. Who wouldn't want to eat the bigger number? It's like getting the bigger slice of pie!

The Four Inequalities

But, did you know that we have three other inequality symbols at our disposal? If we flipped our sign to look like this ( < ), we now have what is called the less than symbol. That's right, you guessed it! The smaller number is written first and the larger number second so that the mouth is towards the larger number. So we can write, for example, 1 < 2, and we read it as 1 is less than 2.

The other two symbols involve both the greater than and less than symbols. The only difference is that it tells us that we can also have the two sides equal. So we have the greater than or equal to symbol ( >= ) and the less than or equal to symbol ( <= ).

Greater than or equal to:

null

Less than or equal to:

null

For example, we can write 6 <= 6, or we can write 5 <= 6. We can also write 6 >= 6 or 7 >= 6. I can write 6 <= 6 or 6 >= 6 because both symbols allow for the numbers to be equal.

True or False Statements

Here is where we get into true or false statements. Sometimes we are given a problem that asks whether a particular inequality is true or not. For example, we may be asked to determine whether the statement 80 > 90 is true or not. How do you work with these problems? Well, you use your knowledge of counting and which numbers are larger to compare the numbers, and then you look at the symbol to see if it is the correct one.

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