Question: Suppose PCA is performed on a two-dimensional data set with the variables X1 and X2, and the principal components can be written as follows: PC1

Suppose PCA is performed on a two-dimensional data set with the variables X1 and X2, and the principal components can be written as follows: PC1 = -(12/13)X1 + (5/13)X2 PC2 = (5/13)X1 + (12/13)X2 Urgent please ! What is the PC1 component of the point that is converted from (X1, X2) = (8, 9)?

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