章节大纲

  • Section 3.2 The Coordinate Plane 
    ::第3.2节 协调计划

    Review
    ::回顾






    1. A = (5, 1)
      ::A=(5,1)
    2. B = (2, 0)
      ::B=(2,0)
    3. C = (-2, -4)
      ::C = (-2, 4)
    4. Quadrant II
      ::二次四方会议
    5. Quadrant IV
      ::第四四四大四国
    6. Quadrant III
      ::四方三
    7. Quadrant I
      ::四方一

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    1. Answers will vary. Examples: (-1, 5) & (2, -5)
      ::答复将各有不同,例如伤心-1,5)和(2,5)和(2,5)
    2. A rectangle

      An irregular pentagon

      ::矩形 一个非常规的五角形
    3. a) across the x-axis = (3, -2), across the y-axis = (-3, 2), about the origin = (-3, -2)
      b) across the x-axis = (-4, 3), across the y-axis = (4, -3), about the origin = (4, 3)
      c) across the x-axis = (-2, 0), across the y-axis = (2, 0), across the origin = (2, 0)
      ::a) 横横x轴=(3,2)横横Y轴=(3,2),横横x轴=(3,2),跨x轴=(3,2),跨x轴=(4,3),跨Y轴=(4,3),跨x轴=(4,3,3),跨x轴=(4,3,c),跨x轴=(2,0),横Y轴=(2,0),跨源=(2,0)
    4. a) Russia   b) Argentina
      :伤心a) 俄罗斯b) 阿根廷
    5. a) (-2, 3)   b) (-5, -4)   c) (4, -1)
      :伤心a) (-2,3) b) (5, 4, c) (4, 1)

     

    Section 3.3: Linear Models
    ::第3.3节:线性模型

    Review
    ::回顾

    1. Non-linear
      ::非线性
    2. Linear
      ::线性
    3. Linear
      ::线性
    4. Linear
      ::线性
    5. Non-linear
      ::非线性
    6. Linear
      ::线性
    7. Linear
      ::线性
    8. Non-linear
      ::非线性
    9. Linear
      ::线性
    10. Non-linear
      ::非线性

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    1. Linear
      ::线性
    2. Linear
         
      ::线性
    3. Linear

      ::线性
    4. Linear, then non-linear
       
      ::线性, 然后非线性
    5. 200 60 = 3.33  hours total =  1 2 3  hours = 1 hour and 40 minutes
      ::= 123小时= 1小时40分钟

    Section 3.4 Finding the Slope of a Line
    ::第3.4节 找出线的曲线

    Review
    ::回顾

    1. Slope =  4 2 = 2  
      ::斜坡=42=2
    2. Slope =  - 2 6 = - 1 3  
      ::斜坡 = -26=-13
    3. Slope = 0
      ::斜坡=0
    4. Slope = undefined
      ::斜缩 = 未定义
    5. Slope = -5
      ::斜坡 = -5
    6. m =  - 6 2 = - 3  
      ::m = - 62=-3
    7. m =  0 5 = 0  
      ::m=05=0
    8. m =  - 4 - 12 = 1 3  
      ::m = -4-12=13
    9. m =  5 0 =  undefined
      ::m=50=未定义
    10. m =  4 - 10 = - 2 5  
      ::m = 4-10=-25

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    1. m =  - 2 b 1 a = 1 2 ;   b = - 3 ,   a = - 1  *without reducing slope fraction, so more answers are possible
      ::m = -2-b1-a=12;b=-3;a=-1 * 不减少坡度分数,因此可以有更多的答案
    2. Slope =  4 30 = 13.3 %. No   
      ::斜坡=430=13.3%。
    3.  Slope =  4 15 0.2667 . Yes, since it is less than 0.3.
      ::斜坡=4150.2667。是的,因为它小于0.3。
    4.  Slope =  1 11   
      ::斜坡=111
    5. $ 45  

     

    Section 3.5: Finding the Equation of a Line in Slope-Intercept Form
    ::第3.5节:在斜坡-截取形式中找到线的公式

    Review
    ::回顾

    1. y = 2x + 3
      ::y = 2x + 3 y = 2x + 3
    2. y = - 1 4 x + 2.6  
      ::y=14x+2.6 y=14x+2.6
    3.   y = - 5 2 x 5  
      ::y=-52x-5
    4.   y = x + 2  
      ::y=x+2 y=x+2
    5.   y = - 3 4 x + 3 1 2  
      ::y=-34x+312 y=-34x+312
    6. y = - 1 2 x + 1 1 2  
      ::y=12x+112
    7. y = 3 5 x 4  
      ::y=35x-4
    8. Green line:  y = - 5 x + 14  
      ::绿线:y=-5x+14
    9. Blue line:  y = 3 x + 10  
      ::蓝线:y=3x+10
    10. Red line:  y = - 3 4 x 5 1 4  
      ::红线: Y=- 34x-514
    11. Purple line:  y = 1 6 x 8 1 6  
      ::紫线: Y=16x-816

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    1. a) y = 5, b) y = b
      ::a)y=5,b)y=b
    2. y = 2 , 989.45 y 1 0 5 x + 2 , 989.45  
      ::y=2,98945-y10-5x+2,98945
    3. c = 140.55x
      ::c = 140.55x
    4. v f = 250 + 21.937 t  
      ::vf=250+21.937t
    5. y = 3.2 5 ¯ x + 3 . In 2017,  3.2 5 ¯ ( 14 ) + 3 = 48.58 %
      ::y=3.25x3. 2017年,3.25'(14)+3=48.58%

     

    Section 3.6:    Other Forms of the Equation of a Line
    ::第3.6节: " 线形 " 的其他形式

    Review
    ::回顾

    1. y + 5 = 2 ( x 3 )  
      ::y+5=2(x- 3)
    2. y + 3 = - 1 2 ( x 6 )  
      ::y+3=12(x-6)
    3. y 2 = - 3 2 ( x + 1 )  or  y + 7 = - 3 2 ( x 5 )  
      ::y-2=-32(x+1)或y+7=-32(x-5)
    4. y + 3 = 1 5 ( x 5 )  or  y + 5 = 1 5 ( x + 5 )  
      ::y+3=15(x-5)或y+5=15(x+5)
    5. - 3 x + 2 y = 12  
      ::-3x+2y=12
    6. 3 x + y = 12  
      ::3x+y=12 3+y=12
    7. 2 x + 3 y = 12  
      ::2x+3y=12
    8. - 4 x + y = 0  
      ::-4x+y=0
    9. y = - 4 5 x + 4  
      ::y=- 45x+4 y=- 45x+4
    10. y = - 3 2 x + 9  
      ::y=-32x+9

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    1. a) y 5 = - ( x + 1 ) .   b) y = - ( x 4 ) .    c) y = - x + 4  for both. No, the point does not matter.
      ::a) y-5=-(x+1),b)y=-(x-4),c)y=-x+4。
    2. a)  y = - A B x + C B , b) A = -1, B = 2, C = -8; -x+2y = -8
      :伤心a) Y=-ABx+CB,b) A=-1, B=2, C=-8; -x+2y=-8
    3. a) 50x + y = 100,500.  b) x = 2,180 
      :伤心a) 50x+y=100 500.b)x=2 180
    4. y - 300 = -55(x+0)
      ::y - 300 = - 55(x+0)
    5. 0.05x + 60 = 165; $2,100
      ::0.05x + 60 = 165; 2 100美元

     

    Section 3.7: Horizontal and Vertical Lines
    ::第3.7节:水平线和垂直线

    Review
    ::回顾

    1. y = 3
      ::y = 3 y = 3
    2. x = -2
      ::x = -2
    3. x = 1
      ::x=1x=1
    4. y = 5
      ::y = 5
    5. x = -6
      ::x = -6 = -6
    6. y = -7
      ::y = - 7 y = - 7




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    1. On x-axis, y = 0;  on y-axis, x = 0
      ::在 X 轴上, y = 0; 在 Y 轴上, x = 0


    Section 3.8: Graphing a Line by Making a Table of Values
    ::第3.8节:通过绘制数值表绘制线条图

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    1. a)
       
      b) 31.5 Euros  
      c) $55
      :伤心a) (b) 31.5欧元c) 55美元

    2. (Note the vertical axis is in thousands.)
      lesson content

      :伤心注意垂直轴以千计。 )


    Section 3.9: Graphing a Line by Finding the Intercepts
    ::第3.9节:通过查找拦截线绘制线条

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    1. Value after 3 years = $14,000. It will be worth $17,500 after 2.5 years.
      ::3年后的价值=14 000美元,2.5年后价值17 500美元。


    2. The intercepts equal the amount to invest to get $162.50 in interest, by investing in only  one or the other fund.
      ::拦截量等于投资达到162.50美元的利息,只投资于一个或另一个基金。


    3. Intercepts = 100%, 10 hours
      ::拦截=100%,10小时
    4.   y = - 5.4 x 1 , 000 + i n i t i a l   t e m p y = - 3.3 x 1 , 000 + i n i t i a l   t e m p
      ::y=-5.4x1 000+初始温度;y=-3.3x1 000+初始温度

     

    Section 3.10: Graphing a Line by Using a Point and the Slope
    ::第3.10节:用点和斜坡绘制线

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    1.  

      points: (1,990, 75), (2,005, 77); slope:  2 15  
      ::点数伤心1 990 75),(2 005 77);斜度:215

    2. 48 bags
      ::48袋

     

    Section 3.11: Parallel Lines
    ::第3.11节:平行线

    Review
    ::回顾

    1. Yes, they are parallel.
      ::是的,它们是平行的。
    2. No, they are not parallel.
      ::不,它们不是平行的。
    3. No, they are not parallel.
      ::不,它们不是平行的。
    4. Yes, they are parallel.
      ::是的,它们是平行的。
    5. y = -2
      ::y = - 2 y = - 2
    6. x = 1
      ::x=1x=1
    7.   y 5 = - 1 3 ( x + 3 )  or   y = - 1 3 x + 4  or  x + 3 y = 12  
      ::y- 5=- 13( x+3) 或 Y=- 13x+4 或 x+3y= 12
    8. y 7 = 1 ( x 4 )  or  y = x + 3  or  - x + y = 3  
      ::y-7=1(x- 4) 或y=x+3 或 -x+3 或 -x+y=3
    9. y 3 = 2 ( x 1 )  or  y = 2 x + 1  or  - 2 x + y = 1  
      ::y- 3=2( x-1) 或 y= 2x+1 或 - 2x+1 或 - 2x+y=1
    10. y + 10 = 1 6 ( x + 18 )  or  y = 1 6 x 7  or  - x + 6 y = - 42  
      ::y+10=16(x+18)或y=16x-7或 -x+6y=-42

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    1. y 14 = 2 ( x 3 )  or  - 2 x + y = 8  or  y = 2 x + 8  
      ::y- 14=2( x-3) 或 - 2x+y=8 或 Y= 2x+8
    2. x = 53 ft and 4 inches tall
      ::x = 53英尺和4英寸高
    3. $16.10
    4. No, the sides are not parallel.

        m A B = - 4 m C D = - 3 , m A D = 1 8 , m B C = 1 4
      ::不,两边不平行。 mAB=4, mCD=3, mAD=18, mBC=14

     

    Section 3.12:     Perpendicular Lines
    ::第3.12节:直直线

    Review
    ::回顾

    1. Perpendicular
      ::心眼
    2. Parallel
      ::平行平行
    3. Perpendicular
      ::心眼
    4. Neither
      ::中 无
    5. y + 2 = - 1 4 ( x + 6 )  or  x + 4 y = - 14  or  y = - 1 4 x 3 1 2  
      ::y+2=-14(x+6) 或 x+4y=-14 或 Y=-14x-312
    6. y 5 = 3 ( x 4 )  or  - 3 x + y = - 7  or  y = 3 x 7  
      ::y - 5= 3(x- 4) 或 - 3x+y=-7 或 y= 3x-7
    7. y 7 = - ( x 4 )  or  y = - x + 11  or  x + y = 11  
      ::y-7=-(x- 4) y=- x+11 或 x+y= 11
    8. y 4 = 1 3 ( x + 12 )  or  - x + 3 y = 24  or  y = 1 3 x + 8  
      ::y - 4= 13( x+12) 或 - x+3y= 24 或 y= 13x+8
    9. y = - 9  
      ::y=9岁
    10. y + 10 = - 6 ( x 3 )  or  6 x + y = 8  or  y = - 6 x + 8  
      ::y+10=-6(x- 3) 或 6x+y=8 或 Y=-6x+8

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    1. blue line: y = x + 1 , purple line: y = - x + 7 ; perpendicular
      ::蓝线:y=x+1,紫线:y=x+7;垂直
    2. m p o s i t i v e = 3 3 = 1 m n e g a t i v e = \text{-} 3 3 = - 1 ; perpendicular
      ::毫正=33=1, 内阴性{ text{-}33=-1; 垂直
    3. y = - A B x + C B ,   s o   m = - A B   a n d   m = B A   
      ::y=-ABx+CB, m=-AB和mBA
    4. Yes, since two sides are perpendicular to each other, and thus form a right angle.
       
      m A B = 4 4 = 1 m B C = 6 2 = 3 , m A C = - 2 2 = - 1  (AC and AB are perpendicular.)
      ::是,因为两侧相互垂直,因此形成一个右角。 mAB=44=1, mBC=62=3, mAC=22=1(AC和AB是垂直。 )

    5.  
      y 0 = 2 3 ( x 0 )  or  y = 2 3 x  or  - 2 x + 3 y = 0  
      ::y- 0= 23(x- 0) 或 y= 23x 或 - 2x+3y= 0

     

    Section 3.13: Graphing Linear Inequalities of Two Variables
    ::第3.13节:绘制两个变量线性不平等图

    Review
    ::回顾







    1. y > - 5 2 x + 2  
      ::y>-52x+2
    2. x 3  
      ::x% 3
    3. y - x 6  
      ::yx-6
    4. y > 5 x 5  
      ::y>5x- 5

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    1.    
    2. y - 6 13 x + 100 13 . Answers will vary. Options include: 17 washer & 0 refrigerators; 16 washers & 1 refrigerator; 14 washers & 2 refrigerators.
      ::y-613x+10013. 答案会有所不同。 选项包括: 17个洗衣机和0个冰箱; 16个洗衣机和1个冰箱; 14个洗衣机和2个冰箱。
    3. If  x  represents the coffee at $9 per pound, and  y  represents the coffee at $7 per pound:

      ::如果x代表每磅9美元的咖啡,y代表每磅7美元的咖啡:

    4.  Answers will vary. Options include: 40 daytime minutes & 0 night time; 200 nighttime & 0 daytime; and 60 each.
      ::答案会有所不同。 选项包括: 40 日间分钟和 0 夜间; 200 夜间和 0 日间; 以及 每人 60 个 。
    5. 10 A + 4 C < $ 5 , 000

      ::10A+4C < 5,000美元

    Section 3.14: Graphing Absolute Value Functions
    ::第3.14节:绝对值函数图

    Review
    ::回顾

    1.

    2.

    3. 

    4.

    5.

    6.

    7.

    8.

    9.

    10.

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    1. The absolute value function that represents this situation is  y = | x 90 | , where x is your sea level before diving. By graphing this function, you can see that the vertex occurs at the point (90, 0).  
      ::表示此状态的绝对值函数是 yx- 90 , x 是潜水前的海平面。通过图形化此函数,您可以看到顶点( 90, 0) 发生于点( 90, 0) 。


    2. One has vertex at (-1, 0), and the other at (0, 1).
      ::一个在(-1,0)有顶点,另一个在(0,1)有顶点。
    3. Yes. Explanations will vary since there is no shift. A reflection across y would be the same. Also, the stretch/shrink for horizontal/vertical changes would equal the same sets of points. 
      ::是的,解释会因没有变化而有所不同。横跨y的反射将是相同的。此外,横向/纵向变化的拉伸/缩小将等于相同的一组点数。