12.3 图象的妙用

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    15-Mar-2016

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12.3 . . . 2.5. 1 y=2x-5 , 0 0 , . -5. 2 . X Y . . 3 . . 1. 2x-y-5=0. y=2x-5. . . . , ; . . - PowerPoint PPT Presentation

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  • 1y=2x-5 , 0 0 , 2.5-5 3 2XY

  • 2x-y-5=0y=2x-5 ,;1

  • y=kxb13xy=7 (2) 3x4y=13:(1) y=3x+7 (2) :4y=3x+13

  • 1 y=2x-52y=2x-5 2x-y=5 2y=2x-5

  • Y=3x+1Y=-2x+61y=-2x+6y=3x+12:2x+y=63x-y=-1X=1Y=4(1,4)

  • p81-821

  • x+y=5 5x-2y=4,y=-x+5P23

  • y =x4y=2x1

    1313 1

  • y x(/)

    (1) yx (2) 150

    y=kx+b120,120140,1002y=150-x+240=150x=90901501 ( ) y=-x+240

  • (1) y=kx+b

    (2) k.b (3) (4) k,b

  • 1 x=1y=-x+4y=2x+1 2y=x-2y=2x+4-6-8 1,3x=-6Y=-8

  • y=kx+b A-21B1-5

    y=-2x-3A-21B1-5

  • P84 A 3 4P84 B1

  • www.21cnjy.com