To find the constant of proportionality \( k \) for the given pairs \((x, y)\), we can use the formula \( k = \frac{y}{x} \) for each pair of values.
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For the first pair \((1, 0.75)\): \[ k_1 = \frac{0.75}{1} = 0.75 \]
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For the second pair \((4, 3)\): \[ k_2 = \frac{3}{4} = 0.75 \]
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For the third pair \((8, 6)\): \[ k_3 = \frac{6}{8} = 0.75 \]
Since all pairs give a constant of proportionality of \( 0.75 \), we conclude that:
The constant of proportionality for this graph is 0.75.