Chapter 4 - Demand, Supply, and Market Equilibrium - Exercises - 4.1 The Demand Curve - Page 92: 1.7b

11,000 plates

Find the slope of the demand curve. $slope=\frac{6000-16000}{60-40}=\frac{-10000}{20}=-500$ Use the slope to find the new point. $-500=\frac{6000-d}{60-50}$ $-500=\frac{6000-d}{10}$ $-500\times10=\frac{6000-d}{10}\times10$ $-5000=6000-d$ $-5000+5000+d=6000-d+5000+d$ $d=11000$