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Big Ideas Math Integrated I, 2016 View details

4. Graphing Linear Equations in Standard Form

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Exercise 41 Page 134

What happens when you subtract a negative number?

-4/5

Practice makes perfect

To simplify this expression, we need to consider the order of operations. We should fully simplify the numerator and denominator before trying to calculate the quotient.

-3-9/8-(-7)

SubNeg

a-(- b)=a+b

-3-9/8+7

AddSubTerms

Add and subtract terms

-12/15

ReduceFrac

a/b=.a /3./.b /3.

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MoveNegNumToFrac

Put minus sign in front of fraction

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Understanding Subtracting a Negative Number

The idea of subtracting a negative number might be confusing. a-(- b)=a+b Try thinking about it in terms of English instead. When a double negative is used in conversation, it changes the meaning to be positive.

Your friend: Why are you going to the school play this Saturday?
You: I would never NOT go to a school play! I get extra credit in my English class if I go!

Saying never not means you always go. Math works the same way!

Subchapter links

Communicate Your Answer p.129

Monitoring Progress p.130-132

Exercises p.133-134

Exercise 41 Page 134

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