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### Course: Grade 7 (VA SOL)>Unit 1

Lesson 5: Absolute value

# Comparing absolute values on the number line

In this math lesson, we explore absolute values and inequalities using a number line with three numbers: a, b, and c. We determine the truth of four inequalities: a < b, |a| > |b|, |a| < |c|, and a < c. By understanding number positions and absolute values, we can easily solve these inequalities.

## Want to join the conversation?

• Did Sal actually say " the number "b"?
• Yes, he even said that to A and C.
• what happens if you get an negitive of an negitive
• the negative of a negative number would be the opposite of a negative number, a positive number.

example: -(-4) = 4.
• the number b taste good
• 0-0
I...What?
• Did Sal really say number A number B number C?
• Yep, it's because variables are letters that replace numbers so you could refer to them that way, which Sal did.
• In the last review of Lesson 6 it had a question where it compares |9|___ -9 and the answer was not equal but rather
|9|>-9, so why here |a| = |c|?
• I Watched it it it still says not finished
• You have to watch a certain amount of the video to complete it. If you skip the video enough then it wont finish, just watch it again some more
(1 vote)
• What do you do in an equatoin like this
|r|-8=-1 ?
(1 vote)
• You can still add 8 to both sides to get |r| = 7, so set whatever is inside to positive and negative, r = -7 or r=7.
Imagine you have |r-8|=1 (you could not have a negative 1 because absolute value has to be greater or equal to 0). So r-8=1 gives r = 9 or r-8=-1 so r=7.
(1 vote)
• where is the absolute value inequalities.
(1 vote)
• we doing some math lets go
(1 vote)
• On seconds why does he say number A instead of letter A?
(1 vote)
• He did not make a mistake. In this situation the letters are representing a variables. Its a unknown number that Sal represents there.