The amounts of 6 restaurant bills and the corresponding amounts of the tips are given in the table below.

Bill / 49.72 70.29 106.27 97.34 88.01 32.98

tip/ 5.28 10.00 16.00 16.00 10.00 4.50

Find the following:

The regression equation isy^= + x

If the amount of the bill is $50,50,the best prediction for the amount of the tip is