Bell Ringer Which expression represents the sequence: -8, -17, -26, -35, … A) -8n B) -8n + 1 C) -9n D) -9n +1.

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Presentation transcript:

Bell Ringer Which expression represents the sequence: -8, -17, -26, -35, … A) -8n B) -8n + 1 C) -9n D) -9n +1

Could You Make a Table? Term (n)Value

Review/Preview  How could you figure out the equation from question #7? AUTO LOAN PAYOFF Time (months)Amount Remaining 0$5,000 1$4,800 2$4,600 3$4,400 4$4,200

Option #1: Plug it in…  A) y = -800x (1) + 5,000 = $4,200  B) y = -200x + 5, (1) + 5,000 = $4,800  C) y = 200x – 5,000200(1) + 5,000 = $5,200  D) y = 800x – 5,000800(1) – 5,000 = -$4,200 The only substitution that worked was letter B! B) y = -200x + 5,000

Option #2: Look for a Rate of Change Can you see the constant change in money? Where is it starting from? B) y = -200x + 5,000 AUTO LOAN PAYOFF Time (months)Amount Remaining 0$5,000 1$4,800 2$4,600 3$4,400 4$4,200 We’ll talk later about making the equation!

Lesson Essential Question  How do you find the rate of CHANGE from an xy-table?

Today’s Agenda  1. Bell Ringer  2. Keystone Packet Preview  3. Rate of Change Part 1/Team Mastery  4. Rate of Change Part 2/Team Huddle  5. Matching Summary/HW

Rate of Change: On the Mooove  To find the rate of change in your table:

Rate of Change Part 2

Summary: Match It  1. Open ebackpack.  2. Select “Matching Rates.”  3. Slide the rates of change to the XY-table.  4. Raise your hand for confirmation.  5. Work on homework.