C1_W1_Lab04_Gradient_Descent_Soln- unable to understand this graph and code

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

Can anyone help me with graphs plotting in GRADIENT SECTION. The code is given and working properly but I am not able to understand graphs like how its being plotted, how to read it. Also…how here w_final is multiplied with 1.0 then 1.2 then 0.1

print(f"1000 sqft house prediction {w_final1.0 + b_final:0.1f} Thousand dollars")
print(f"1200 sqft house prediction {w_final1.2 + b_final:0.1f} Thousand dollars")
print(f"2000 sqft house prediction {w_final*2.0 + b_final:0.1f} Thousand dollars")

2

Please post a screen capture image that shows the plots you are asking about.