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Learning objective

Create value tables and draw, identify, and analyze graphs for functions such as y = x + x - 4, y = 2x + n (where n can be -2, -1, 0, 1, 2, 3), y = ax (with a being a rational number), and y = ab + c (where b is a positive integer). Additionally, solve related equations graphically, such as determining where a line intersects a curve and finding roots using graphical methods. Also, draw and interpret graphs that depict exponential growth and decay scenarios.

Read the explanation, check the common trap, then practise with flashcards and questions.

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  • Read the explanation.
  • Check key terms.
  • Practise with linked questions.
Cambridge IGCSE MathematicsExtended Algebra and graphsSupplement content

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Quick explanation

Create value tables and draw, identify, and analyze graphs for functions such as y = x + x - 4, y = 2x + n (where n can be -2, -1, 0, 1, 2, 3), y = ax (with a being a rational number), and y = ab + c (where b is a positive integer). Additionally, solve related equations graphically, such as determining where a line intersects a curve and finding roots using graphical methods. Also, draw and interpret graphs that depict exponential growth and decay scenarios

  • This point belongs to Graphs of functions, especially Graphs of functions outcomes.
  • You need to be able to create value tables and draw, identify, and analyze graphs for functions such as y = x + x - 4, y = 2x + n (where n can be -2, -1, 0, 1, 2, 3), y = ax (with a being a rational number), and y = ab + c (where b is a positive integer). Additionally, solve related equations graphically, such as determining where a line intersects a curve and finding roots using graphical methods. Also, draw and interpret graphs that depict exponential growth and decay scenarios.
  • The key ideas to know are Construct, Plot, and Show.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

ConstructPlotShowSketch

Why it matters

This objective helps connect Graphs of functions outcomes to exam-style questions, flashcards, and revision notes for Graphs of functions.

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Paper 2 structured question: Graphs of functions

Paper 2Core or Extended Mathematics6 marks

Description

Graph of y = 2x + n

Consider the family of linear functions y = 2x + n where n can be -2, -1, 0, 1, 2, or 3.

xy when n=1y when n=3
-1
0
1
2
  1. a

    Calculate Complete the value table for y = 2x + 1 and y = 2x + 3 for x = -1, 0, 1, 2.

    Aim for approximately 4 distinct marking points.

    [4]
  2. b

    Plot Plot the graphs of y = 2x + 1 and y = 2x + 3 on the same axes using the completed tables.

    Aim for approximately 2 distinct marking points.

    [2]
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