2. Linear demand (a) Prove mathematically that along a linear demand, e decreases as P decreases. (b) Suppose the vertical intercept of a linear demand is 91. What can you say about le| at P = 56? (c) Suppose the horizontal intercept of a linear demand is 44. What can you say about le at Q = 16? (d) Suppose two linear demand curves D and D, have the same vertical intercept and D is steeper than D. i. At any given P, which demand is more elastic? ii. At any given Q, which demand is more elastic? (e) Suppose two linear demand curves D and D, are parallel to each other and D, is higher than D. i. At any given P, which demand is more elastic? ii. At any given Q, which demand is more elastic?