graphs

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  • Maths
    • Straight line graphs
      • Drawing
        • 1. choose 3 values of x & draw a table
        • 2. Work out y for each x.
        • 3. plot coordinates ad join up as a straight line.
        • 4. Label the graph
      • Graphs when x or y =
        • y=a
          • horizontal line, all values of y=a
        • x=b
          • vertical line, all value of x=b
        • x+y=k
          • k is a number
          • sum of x and y equals k
          • therefore, k is value of y intercept.
      • Interpreting y=mc+x
        • m = gradient
          • As m increases, graph gets steeper
          • If m is +, line slopes upwards
          • If m is -, line slopes downwards
          • Parallel lines have the same gradient
          • product of perpendicular gradients = -1
          • Perpendicular gradient: 1/m
        • C is the intercept, where the graph cuts the y-axis
        • Finding gradient
          • Change in y divided by change in x
    • Curved graphs
      • Graphs involving x3
        • y=ax3+bx2+cx+d
        • An s shaped graph
          • Untitled

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