-In the figure above, an increase in z leads to a
A) movement up along one of the lines showing the relationship between x and y.
B) movement down along one of the lines showing the relationship between x and y.
C) rightward shift of the line showing the relationship between x and y.
D) leftward shift of the line showing the relationship between x and y.

Question

-In the figure above, an increase in z leads to a
A) movement up along one of the lines showing the relationship between x and y. 
B) movement down along one of the lines showing the relationship between x and y. 
C) rightward shift of the line showing the relationship between x and y. 
D) leftward shift of the line showing the relationship between x and y.

Quizplus · Accepted Answer

An increase in a parameter like z, which is not explicitly shown on the axes representing x and y, typically results in a shift of the entire relationship curve or line, rather than a movement along the curve. Since z is not one of the variables directly plotted on the axes, its change affects the position of the curve, indicating a change in the relationship between x and y, hence a rightward or leftward shift.

-In the Figure Above, an Increase in Z Leads to a