Assume demand functions for good 1 and good 2 are given by the equations x1 = m/(2p1) and x2 = m/(2p2), where m is income and p1 and p2 are prices. Let the horizontal axis represent the quantity of good 2. The Engle curve for good 2 is a Oa horizontal line. O a straight line with a slope of 2p2. O a straight line with slope 1/2p2. O a straight line with a slope of 2p1. O a vertical line.