To find the relationship between the number of stitches and the length of the row, we can look for a consistent multiplier between the two variables.
Let's analyze the data provided:
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For 5 stitches, the length is 1 cm: \[ \frac{5}{1} = 5 \]
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For 15 stitches, the length is 3 cm: \[ \frac{15}{3} = 5 \]
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For 20 stitches, the length is 4 cm: \[ \frac{20}{4} = 5 \]
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For 30 stitches, the length is 6 cm: \[ \frac{30}{6} = 5 \]
In each case, the number of stitches is 5 times the length.
Thus, the correct relationship is:
The number of stitches is 5 times the length.