Which of these is a rule that relates shoe size to foot length?

Question

Which of these is a rule that relates shoe size to foot length?
1. foot length = (shoe size × 2) - 3
2. foot length = shoe size + 9
3. foot length = (shoe size × 1) + 3
4. foot length = (shoe size × 2) + 3

SnapAndSolve AI · Accepted Answer

To find the correct rule, we need to check each option against the given data:

For shoe size 3, foot length = (3 × 2) - 3 = 6 - 3 = 3. This does not match the foot length of 3.
For shoe size 3, foot length = 3 + 9 = 12. This does not match the foot length of 3.
For shoe size 3, foot length = (3 × 1) + 3 = 3 + 3 = 6. This does not match the foot length of 3.
For shoe size 3, foot length = (3 × 2) + 3 = 6 + 3 = 9. This does not match the foot length of 3.

Let's try shoe size 4:

For shoe size 4, foot length = (4 × 2) - 3 = 8 - 3 = 5. This matches the foot length of 5.
For shoe size 4, foot length = 4 + 9 = 13. This does not match the foot length of 5.
For shoe size 4, foot length = (4 × 1) + 3 = 4 + 3 = 7. This does not match the foot length of 5.
For shoe size 4, foot length = (4 × 2) + 3 = 8 + 3 = 11. This does not match the foot length of 5.

The correct rule is option 1: foot length = (shoe size × 2) - 3.

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Which of these is a rule that relates shoe size to foot length?

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