January 9 ms wu says follow the instructions below
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January 9 Ms. Wu says … follow the instructions below! PowerPoint PPT Presentation


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January 9 Ms. Wu says … follow the instructions below!. (-4, 12) (10, 6) 34. a. 2 = m + b; 12 = -4m + b b. m = -2, b = 4 c. y = -2x + 4 35. L = 4.5 ft; w = 2.5 ft. Find your new seat . Get out HW 3.2 (don’t have to tear out). Get started on the warm up quietly .

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January 9 Ms. Wu says … follow the instructions below!

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January 9 ms wu says follow the instructions below

January 9Ms. Wu says … follow the instructions below!

  • (-4, 12)

  • (10, 6)

  • 34. a. 2 = m + b; 12 = -4m + b

  • b. m = -2, b = 4

  • c. y = -2x + 4

  • 35. L = 4.5 ft; w = 2.5 ft.

Find your new seat.

Get out HW 3.2 (don’t have to tear out).

Get started on the warm up quietly.

Grade HW 3.2.

_______________________________________________

(-3, 29)

(5, 7)

(-2, 2)

(4, 5)

(-15, -62)

(5, 3)

23. The two equations should be subtracted rather than added; 6x – 8; x = 4/3


New stuff for 2 nd semester

New stuff for 2nd semester:

  • Warm ups

    • Will not be turned in; grade in class; 10% final grade; points deducted for talking/not doing it/being off-task

  • Quicky quizzes

    • Every class period; worth 5 – 10 pts; drop 2 lowest scores; if absent, counts as dropped score

  • Late homework

    • Name on door for a week; if not crossed off, mandatory tutorials (call home)

  • Homework quizzes

    • Worth 10 pts.; can use homework; cannot drop or make up; if absent, grade homework as quiz


The elimination method pt 2

The Elimination Method, pt. 2

Ex1: 3x – 4y = 14

2x + 2y = 21


The elimination method pt 21

The Elimination Method, pt. 2

Ex 2: 5x – 6y = 12

3x – 5y = 24


The elimination method

The Elimination Method

Process:

  • Pick the variable you want to eliminate.

  • Multiply one, or both, equations by a value to make sure the coefficients of the chosen variable are the same (for subtraction) or opposite (for addition).

  • Subtract/Add and Solve the resulting equation.

  • Go back to one of the original equations and solve for the other variable.


Group activity

Group Activity

  • Study the following Linear Inequalities and determine at least 5 different points (x, y) that make each inequality true.

  • Plot the points on the board. You cannot plot the same point as another group!

  • What do you notice about the points that make each linear inequality true?

  • x ≤ 4B) y > -2

  • C) y < ½ x – 2D) 2x – y ≥ 4


Graphs from the activity

Graphs from the activity.

A

B

C

D


Steps to graphing

Steps to Graphing

  • Graph the boundary line

  • Determine if the boundary is inclusive (solid line) or exclusive (dotted/dashed line)

  • Test a point and shade the appropriate half plane.


Graphing linear inequalities

Graphing Linear Inequalities

The graphs consist of

1) Boundary Line (graph of corresponding equation)

---- for exclusive

___for inclusive

2) Half-Plane (shaded to indicate included points)

Half-Plane: The points on a plane that fall on one side of a boundary line.


Sample problems

Sample Problems

  • Determine if (4, 5) is a point that satisfies 4x + 2y < 12

  • Write inequalities that describes the graphs below.


Sigma 3

SIGMA #3

  • 10 pt class work grade

  • 30 minutes, calculators allowed


Quicky quiz

Quicky Quiz

  • 5 minutes

  • Worth 5 points

  • No notes allowed


Hw 3 3

HW 3.3

  • Pgs 454 – 455: 5, 7, 11, 13, 21, 23, 27, 31, 33, 37


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