Problem #10: Let W be the plane with the equation 5x - y + 7z = 0. Find the standard matrix P for the orthogonal projection onto W. Use the following formula
P = A(A$^T$A)$^{-1}$A$^T$,
where the matrix A is constructed using any basis for W as its column vectors.
Enter the first row of the matrix P (in order) into the answer box below, separated with commas. i.e., enter the values $P_{11}$, $P_{12}$, $P_{13}$.