C1_W2_Linear_Regression - AssertionError: Case 1: dj_db is wrong: -10.0 != -2

Course Q&A Machine Learning Specialization Supervised ML: Regression and Classification
1

{moderator edit: images of code removed}

Want to ask why dj_db is equal to (f_wb - y[i]) * x[i]) not (f_wb - y[i]) …

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2

Since the bias is a constant, its partial derivative does not vary with x(i).

3

Please do not post your code on the forum, that’s not allowed by the Code of Conduct.
I have edited your post to remove the code.