Question 739859
y' = –13 + 4x1 + 22x2 + 14x3 + 3x4


z' = –13 + 4(x1+2) + 22x2 + 14x3 + 3x4 ... replace x1 with x1+2, replace y' with z'


z' = –13 + 4x1+8 + 22x2 + 14x3 + 3x4


z' = –13 + 4x1 + 22x2 + 14x3 + 3x4 + 8


z' = (–13 + 4x1 + 22x2 + 14x3 + 3x4) + 8


z' = (y') + 8


z' = y' + 8


So this shows you that y' increases by 8 (to get z')


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Answer:


If x1 increases by 2, then y' increases by 8


Similarly, if x1 decreases by 2, then y' decreases by 8


So overall, if x1 changes by 2, then <font color="red">y' changes by 8</font>


Note: all other input variables are assumed to be fixed.