Question 206663
Write a rule for the European size as a function of the US' size, Then use youe functiob to predict the European size of a US size 11 shoe 
US size: 3.5, 4, 4.5, 5, 5.5, 6,
European:35,35.5,36,36.5,37, 37.5 
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Notice that as the US size goes up one, the European size goes up one.
So the slope is 1
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Using th point (3.5 ,35) and the slope you can find the intercept:
35 = 1*3.5 + b
b = 31.5
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Equation:
E(x) = 1*x + 31.5
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Then use youe functiob to predict the European size of a US size 11 shoe 
E(11) = 11 + 31.5
E(11) = 42.5
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Cheers,
Stan H.