Problems of the day

1.

Write a Maple procedure that takes a list of (x,y) data points and returns the slope and y-intercept of the line of best fit.

Example: best_line([[2,3],[4,5], [6,8]]);

$$\{m=\frac{5}{4},b=\frac{1}{3}\}$$

2.

Decode the following message. It was encoded using the second Caesar cipher algorithm with an offset of 3: ``WrCehCruCqrwCwrCehBCwkdwClvCwkhCtxhvwlrqA''. What letter gives the capital C's in the encoded message?