1. Shortest distance between: 5x^2 - 6xy + 5y^2 = 4 and origin. 2. d = sqrt(x^2 + y^2) 3. d = sqrt[(4+6xy)/5]. Can't figure out how to get an explicit equation in x or y. This is a first semester calculus problem out of Thomas from my 1971 class. This is indepent study.