Do Now 9/27/10 Take out HW from Friday. Be ready to copy POTW #3

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4.1- Plot Points in a Coordinate Plane

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Do Now 9/27/10 Take out HW from Friday. Be ready to copy POTW #3 - Text p. 45, #12-24 evens, 28-40 evens Copy HW in planner. Text p. 49, #8-28 evens, 32 & 34 Chapter 1 TEST Wednesday!! Be ready to copy POTW #3

Homework Text p. 45, #12-24 evens, 28-40 evens 12) 60 14) -13 16) -350 18) 2 20) -7 22) 340 24) -5(-12)=60 28) a) -49 m b) -48m c) mean 30) 512 32) -2 34) 100 36) < 38) -160 40) -96

Objective SWBAT identify and plot points in a coordinate plane In your notebook, explain how you can decide whether the answer to a multiplication problem with integers is positive or negative. Then solve the problem below. (-1)(-1)(-1)(-1)(1)(-1)(-1)(-1)(1)(-1)(-1) Nine negative signs = -1

Section 1.8 “The Coordinate Plane” y-axis Quadrant II (-,+) Quadrant I (+,+) Origin (0,0) x-axis Quadrant III (-,-) Quadrant IV (+,-)

Plotting Points (5,2) y-axis x-axis ordered pair y – coordinate 4 x – coordinate 3 2 1 x-axis 1 2 3 4 5 6

Plotting Points (2,4) (-3,4) (2,-3) (-6,-4) y-axis x-axis ordered pair 5 C 4 A 3 (2,-3) 2 1 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 x-axis -1 (-6,-4) -2 -3 B D -4 -5

Plotting Points (4,3) (-4,3) (4,-2) (-4,-2) y-axis x-axis Plot the points A (4,3), B (4,-2), C (-4,-2), and D (-4,3). Then find the area and perimeter of the figure. y-axis (4,3) 5 (-4,3) 4 D 3 A 2 1 -6 -5 -4 -3 -2 -1 1 2 3 4 5 6 x-axis -1 (4,-2) (-4,-2) -2 B C -3 -4 Perimeter = 5 + 8 + 5 + 8 = 26 units Area = 5 x 8 = 40 sq. units -5

Scatter Plot- Line of Fit- the graph of a set of ordered pairs Enrollment at Howell Middle School South 760 Line of Fit- a line that can be used to estimate data on a scatter plot 750 740 730 enrollment 720 Use a line of fit to estimate the enrollment in the 2009. 710 700 690 The enrollment in 2009 will be approximately 730 students 680 00 01 02 03 04 05 06 07 08 09 year

Graphing Activity Plot the points according to the directions. Then connect the dots. What mystery figure have you created?

NJASK7 Prep Homework Text p. 49, #8-28 evens, 32 & 34