2.2 Subtracting Rational Numbers. 2.2 – Subtracting Rational #s Goals / “I can…” Subtract rational numbers Apply subtraction.

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Presentation transcript:

2.2 Subtracting Rational Numbers

2.2 – Subtracting Rational #s Goals / “I can…” Subtract rational numbers Apply subtraction

2.2 – Subtracting Rational #s Example: Using a number line Yesterday when we added, we moved the line to the right. Today when we subtract we move it to the left.

2.2 – Subtracting Rational #s Using your calculator, do the following problems: 5 + (-7) = 5 – 7 = -6 + (-3) = -6 – 3 = What conclusion can you make?

2.2 – Subtracting Rational #s RULE: Add the opposite - to subtract a number, switch the subtraction sign to add and take the opposite of the next number

2.2 – Subtracting Rational #s Example: -6 – 7 = 2.5 – (-7.6) =

2.2 – Subtracting Rational #s How did we solve ?

2.2 – Subtracting Rational #s What if we had more than one number in the absolute value? Treat them like parentheses.

2.2 – Subtracting Rational #s Example: Simplify

2.2 – Subtracting Rational #s Example: Evaluating Expressions Let x = -3 and y = x – y 2. y – x 3. –x – y 4. –x – (-y)