Worksheet: Finding the Rule of a Function Table Using Addition and Subtraction

In this worksheet, we will practice using addition and subtraction to find the rule of a function table.

Q1:

In this function machine, we put 𝑥 in and get 𝑦 out.

It uses the rule add 20 to 𝑥 to calculate 𝑦 .

If we put in 3, what number do we get out?

If we get out 32, what number did we put in?

Which of these equations describes the rule?

  • A 𝑦 = 𝑥 2 3
  • B 𝑦 = 𝑥 2 0
  • C 𝑦 = 𝑥 + 2 0
  • D 𝑦 = 𝑥 × 2 0
  • E 𝑦 = 𝑥 + 2 3

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