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Figure 1 shows a sketch of the curve with equation $y = \frac{3}{x}, \quad x \neq 0.$ (a) On a separate diagram, sketch the curve with equation $y = \frac{3}{x+2}, \quad x \neq -2,$ showing the coordinates of any point at which the curve crosses a coordinate axis - Edexcel - A-Level Maths Pure - Question 7 - 2007 - Paper 1

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Question 7

Figure-1-shows-a-sketch-of-the-curve-with-equation---$y-=-\frac{3}{x},-\quad-x-\neq-0.$---(a)-On-a-separate-diagram,-sketch-the-curve-with-equation---$y-=-\frac{3}{x+2},-\quad-x-\neq--2,$---showing-the-coordinates-of-any-point-at-which-the-curve-crosses-a-coordinate-axis-Edexcel-A-Level Maths Pure-Question 7-2007-Paper 1.png

Figure 1 shows a sketch of the curve with equation $y = \frac{3}{x}, \quad x \neq 0.$ (a) On a separate diagram, sketch the curve with equation $y = \frac{3}{x... show full transcript

Worked Solution & Example Answer:Figure 1 shows a sketch of the curve with equation $y = \frac{3}{x}, \quad x \neq 0.$ (a) On a separate diagram, sketch the curve with equation $y = \frac{3}{x+2}, \quad x \neq -2,$ showing the coordinates of any point at which the curve crosses a coordinate axis - Edexcel - A-Level Maths Pure - Question 7 - 2007 - Paper 1

Step 1

Sketch the curve with equation $y = \frac{3}{x + 2}, \quad x \neq -2$

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Answer

  1. Identify the Characteristics of the Curve:
    The given function is similar to the original function y=3xy = \frac{3}{x}, but is translated horizontally.

  2. Finding the Asymptotes:
    The vertical asymptote occurs where the denominator is zero. Therefore, for the equation y=3x+2y = \frac{3}{x + 2}, the vertical asymptote is at
    [ x + 2 = 0 \implies x = -2. ] The horizontal asymptote is y=0y = 0, as the function approaches zero as xx approaches infinity or negative infinity.

  3. Intercepts:
    To find the x-intercept, set y=0y = 0:
    [ 0 = \frac{3}{x + 2} ]
    which does not yield any valid xx. Therefore, the curve does not intersect the x-axis.
    To find the y-intercept, set x=0x = 0:
    [ y = \frac{3}{0 + 2} = \frac{3}{2}. ]
    Thus, the curve crosses the y-axis at the point ((0, \frac{3}{2})).

  4. Sketch:
    On a new diagram, sketch the curve, showing the asymptotes and the point of intersection at the y-axis.

Step 2

Write down the equations of the asymptotes of the curve in part (a)

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Answer

The equations of the asymptotes are:

  1. Vertical Asymptote:
    [ x = -2 ]
  2. Horizontal Asymptote:
    [ y = 0 ]

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