I worked in sheet4 of the spreadsheet today in class.
Refer to the gradient descent algorithm and the partial derivative formulas on the slides and examine the formulas in the cells described below.

Note: In D2 and E2 I arbitrarily set w0 and w1 to initial values

Look at the fomulas in F2 to F5 to make sure you know what those are doing
as well as more importantly the formulas for G2 to G6 and H2 to H6

Then examine the formulas in D7 and E7 which compute the updated weights