In Exercises 17-24, an orthogonal set Sand a vector v in Span S are given. Use dot products (not systems of linear equations) to represent y as a lincar combination of the vectors in S. г 7 20. S= and y= {DE O -{0) 21. S= and y= 3 1 2 0 9 22. SE = A pue -1 0 23. Se = A pure 5 5 AC-1 -1. 2 1 24. S= and v=