The demand equation for soccer tournament T-shirts is xy - 3,000 = y, where y is the number of T-shirts the Enormous State University soccer team can sell at a price of $x per shirt. Find dy dx x = 6 dy = -120 T-shirts per dollar dx x = 6 Interpret the result. When the price is set at $6, the demand is dropping V by X T-shirts per $1 increase in price. Need Help? Read It Watch It