Junior Cycle Mathematics Number Systems: Martin creates a pattern of numb

Question

Martin creates a pattern of numbers using the instructions in the table below.
The first number is filled in.

(a) Complete the table.

| Instruction             | First Number | Second Number | Third Number |
|------------------------|--------------|---------------|--------------|
| Starting Number        | 5            | 6             | 7            |
| Multiply by 3         | 5 × 3        | 6 × 3        | 7 × 3        |
| Subtract 5 from your answer | 15 - 5     | 18 - 5       | 21 - 5      |
| Outcome                | 10           | 13            | 16          |

(b) Martin picks a starting number and, using the instructions, gets an outcome of 1. Find the starting number he picked.

(c) When the starting number is k, what is the outcome? Give your answer in terms of k.

Martin creates a pattern of numbers using the instructions in the table below - Junior Cycle Mathematics - Question 12 - 2015

Worked Solution & Example Answer:Martin creates a pattern of numbers using the instructions in the table below - Junior Cycle Mathematics - Question 12 - 2015

When the starting number is k, what is the outcome?

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