How to use this sheet

  • Have the child look across each row, from input to output, and write what was done to the input.
  • Test the rule on every row before writing the equation.
  • Ask which quantity depends on the other, and say it as a sentence: the cost depends on the number of tickets.

Common mistakes

  • Finding a rule down the y column, such as "add 4 each time", and writing y = 4 + x. Look across each row.
  • Writing a rule that works for the first row only.
  • Mixing up the independent and dependent quantities.

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