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Bellwork Identify (write down) which method is easiest to solve with, then do so. How can you tell which method to use? If the problem already has a letter by itself, use _________ If the problem has two equations where a letter will cancel out, use ________ Slope Review y = -2x + 4 What is the name of the thing that tells you where to start a graph? What is the letter that represents the y-intercept? Where do you look in this equation to see where to start a graph? Where do you look to see how far up and how far right to move? What is the name of the thing that tells you how far up and to the right to move? What is the letter that represents the slope? Check for solution Is (1,-2) a solution of the linear equation 5x - 2y = 9? Is (-9,-4) a solution of the linear equation x - 2y = -17? Exponents (Ch. 7) • Base • Exponent Foldable 1. Take out a piece of notebook paper and make a hot dog fold over from the right side over to the pink line. Foldable 2. Now, divide the right hand section into 5 sections by drawing 4 evenly spaced lines. 3. Use scissors to cut along your drawn line, but ONLY to the crease! The fold crease Foldable 4. Write EXPONENTS down the left hand side The fold crease Foldable 5. Fold over the top cut section and write MULTIPLYING (SAME BASE) on the outside. 6. Reopen the fold. The fold crease 7. On the left hand Foldable ( x )( x ) ( x x)( x x x) section, write an x example of multiplying powers with the same base. 2 5 8. On the right hand side, write the rule for multiplying exponents 1. To multiply powers with the same base, add the exponents. 2. Remember… 3 same base - ADD Multiplying example ( x )( x ) (__ __)(__ __ __) 2 3 x Multiplying Rule • To multiply powers with the same base, add the exponents • Remember, multiply…ADD the exponents Dividing example 4 __ __ __ __ __ 2 4 __ __ 5 4 Dividing Rule • To divide powers with the same base, ________ the exponents • Remember, divide…SUBTRACT the exponents Power to a Power example Power to a Power Rule • To raise a power to a power, ___________ the exponents • Remember, power to a power…MULTIPLY the exponents Zero Power Example Zero Power Example Zero Power Rule Negative Power Example Negative Power Rule • A negative power means “_____” over. • Or, take the _________, which means switch the _______ and the _________ • • • • • Multiplying Dividing Power to a power Zero Negative