Marginal rate of substitution of x and y can be shown in the curve by formula

A. $$MR{S_{xy}} = \frac{{ - \Delta y}}{{\Delta x}}$$
B. $$MR{S_{xy}} = \frac{{\Delta x}}{{\Delta y}}$$
C. $$MR{S_{xy}} = \frac{{\Delta y}}{{\Delta x}}$$
D. $$MR{S_{xy}} = \frac{{ - \Delta x}}{{\Delta y}}$$
Answer: Option A

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