Plotting Initial Endowment on the Edgeworth Box Graph

Question: How do you plot the following initial endowment on a Edgeworth box graph? Do the utility functions come into play in any way?

XA = (0, 4), XB = (4, 2), UA = 2X1 + X2, UB = X1+2X2

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...like line A) Now refer to Figure 2. In the same way, from UB = X1 + 2X2, B's indifference curves are parallel lines with a slope of 2. (like line B)

When line A and B pass through the Pareto efficient point C the initial endowment, we know that the trade process can go down along these two lines. ...