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The slow step always determines the rate law. The fast step is the reaction that makes products at a faster rate than the slower step. The slow step determines the rate because if you think about 5 people making a cake, 1:mixing, 2:pouring, 3:putting in oven, 4: frosting, 5:plating, if person number 1 takes forever mixing, then the overall time would depend on the person mixing.
The fast step produces products but if the next step is slow it will use the products of the first step. Then due to le chatelier's principle due to excess products in the first reaction it will then shift back to reactants. Thus, in the end the overall rate boils down to the rate of slowest step.
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