Question: I crated a matrix modeling the system for the below, can you tell me if it is correct or is there something I need to

I crated a matrix modeling the system for the below, can you tell me if it is correct or is there something I need to add.

X1 + x2 + x3 + x4= b

Row 140 + 80 + 75 + 45 = 17.65

Row 280 + 50+ 90+75 = 23.60

Row 355 + 45 + 50 =16.60

Row 430 + 65 +40 + 80 = 17.15

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