Giáo án Song ngữ Đại số 9 - Period 23: The graph of function y=ax+b (a ≠ 0)

Nội dung text: Giáo án Song ngữ Đại số 9 - Period 23: The graph of function y=ax+b (a ≠ 0)

1. PHềNG GD – ĐT LỆ THỦY TRƯỜNG THCS VĂN THỦY  GIÁO ÁNTHAO GIẢNG ĐẠI 9 ‘ ĐỒ THỊ HÀM SỐ Y=AX+B’ Giáo viên: Ngô Thị Hạnh Tổ : Khoa học tự nhiên Năm học: 2018-2019 0) Date written:9/11/2018 Date written:12/11/2018
2. Period 23 : THE GRAPH OF FUNCTION Y=AX+B (a ≠ 0) I- TARGET : 1. Knowledge: - Students grasp the function graph y = ax + b (a ≠ 0) is a straight line that cuts the vertical axis at the point of b in degrees, parallel to the line y = ax if b ≠ 0, straight y = ax if b = 0 2. Skill: - Students draw a graph of the function y = ax + b (a ≠ 0) by defining two points in the function graph. Practice demonstrating the points on the coordinate plane and plotting the function graph. 3.Attitude: -Having a serious learning attitude, self-discipline, carefulness, accuracy when performing point and plot function on the coordinate plane. 4. Capacity towards: - Draw the function graph y = ax + b (a ≠ 0). II- PREPARATION: 1.GV: editor, straight line, sub-record? 1Sgk. 2. HS: Homework, pre-reading, straight-line, sub-group. III- TEACHING PROCESS: 1. Stable organization (1 ') 2. Check the old post (5 ') To plot function y = 2x. 3. New Posts. Activities of teachers Activities of students Content and basic knowledge Activity 1: Learn how to plot functions y = ax + b (16 ') - Do you need HS? HS read? 1. The graph of the function y= - GV hanging table sub- ax + b drawing available grid (a 0) coordinates. - HSTb on the board [?1] GV calls 1HS on the shows the top points of board showing the top a 1 MP coordinates. points of a 1 MP - Students work in coordinates. notebooks. - Teacher observes - HS review articles. students under the class. - Students observe the To Request a comment. graph to comment. To Do you have any comments about your - HS students answered. taste ocation of points A; B; C why? To Do you have any comments on A '; B '; C - HS demonstrates
3. '? comments under the Please prove that guidance of teachers. comment. Suggestions for demonstrating the AA / - HS lecture. BB quadrilateral. BB / CC / is the ?2 parallelogram. - GV draws a comment: - HS read? If A, B, C are on the - HS up the board paste same line (d) then A /, B HS commented. / C are on the same line - Examine the table, (d /). think the answer. * General: (textbook - T.50) - G.v requires Hs active pair. To Give HS a comment * Note: (textbook - T.50) To For the same value of - HSTb replied. the variable x, the corresponding value of - HSK responded. the function y = 2x and y = 2x + 3. To Function graph y = - HS lecture. 2x is the line? To What is the function - 2HS stand at the graph of y = 2x + 3? reading place. - Teacher refuses. - 1HS read the content. - General lecturer (textbook) - Requires 2 students to read, the whole class read silently. * Note teacher (textbook) Activity 2: Learn how to draw a graph (15 ') To When b = 0, what is 2. how to sketch the graph of the function of y = ax + - HS responded function y=ax+b (a 0). b? - HSTb recounted how (SGK) To How do you plot this to draw. function? To How to plot the function graph y = ax + - Some students give b? their opinions. - It may be suggested that the function graph y = ax + b is a straight line - HS lecture.
4. that intersects at the point where b is the angle. - Instructor: In practice, - Students determine usually defined two how to identify the points, especially the intersection. intersection of the graph with two coordinate - How to draw. axes. To How to identify these - Read the textbook. two intersections? ?3 So to graph the function - 1 student on the ) Let x = 0 then y = -3 we get y = ax + b we do? drawing board, HS point A (0; -3). - G.v closes the steps of under the drawing to the Let y = 0 then x = 1.5 we have a plotting the function. notebook. point B (1.5; 0) To Request to repeat. Draw a line through 2 points A, B To Ask students to do [? we get the function graph y = 2x - 3]. 3 y - HS group activities. - HS comment, correct - Teacher observes some if yes. 3 HSYdrawing instructions 2 correctly. To Let HS draw the O 1 x picture and the invariance, the inverse of - the two function graphs. Colouration : 2 - Usually, we define3 one point of the graph: + Cutting axis: A (x = a; y = b) +Point of cutoff axis: B Graph is straight line AB 4. Consolidation (6 ') - Lecturer for individual activities for Unit 16 (textbook): Graph the function y = x; y = 2x + 2 To How can XD be coordinates intersection A of two straight lines (d1); (d2) To Is there any way to accurately determine the coordinates of point A? - Instructor instructs students: Making the equation: x = 2x + 2 Prize: Find x: find y?
5. 5. Guide home (2 ') - Understand basic knowledge of function graph y = ax + b and how to draw that graph. - Exercise VN: 15; 17; 18; 19 (SGK - p.51, 52) - Instructor instructs students to do 15 sgk + 1 student on the spot how to do, other students commented + Instructor commented, presented sample solution. HS attention, note carefully