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Identify the graph of $y = 1 - |x + 2|$ from the options below - AQA - A-Level Maths Mechanics - Question 1 - 2019 - Paper 2

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Identify-the-graph-of-$y-=-1---|x-+-2|$-from-the-options-below-AQA-A-Level Maths Mechanics-Question 1-2019-Paper 2.png

Identify the graph of $y = 1 - |x + 2|$ from the options below. Tick (✓) one box. A B C D

Worked Solution & Example Answer:Identify the graph of $y = 1 - |x + 2|$ from the options below - AQA - A-Level Maths Mechanics - Question 1 - 2019 - Paper 2

Step 1

Identify the correct graph of $y = 1 - |x + 2|$

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Answer

To determine the correct graph, we first analyze the equation:

  1. Understanding the Absolute Value Function: The function involves an absolute value, which indicates that there will be a V-shape in the graph.

  2. Shifting the Graph: The expression x+2|x + 2| means the vertex of the V-shape will be shifted 2 units to the left on the x-axis, giving us a vertex at (-2, 1).

  3. Reflection and Vertical Shift: The negative sign before the absolute value indicates a reflection over the x-axis. The graph is thus flipped upside down from its usual V-shape. The additional +1 translates the whole graph upwards by 1 unit.

  4. Graph Behavior: The graph will have two line segments:

    • One line segment will extend from (-2, 1) vertically downwards.
    • The other line segment will extend upwards to both sides as x moves away from -2.
  5. Comparison with Given Options: Looking at the provided graph options, only option D matches this expected behavior as it displays an inverted V-shape centered at (-2, 1).

Thus, the answer is to tick box D.

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