1. The problem statement, all variables and given/known data This isn't really homework, but a not assigned problem out of my mathbook which is kinda confusing me.. #74. We have two pairs of parallel lines in R^2 defined by the linear equations below: a1x + b1y = r1 a1x + b1y = s1 a2x + b2y = r2 a2x + b2y = s2 We assume that these lines enclose a parallelogram P. Find the very simplest formula for the area of P in terms of a1, b1, a2, b2, r1, r2, s1, s2. 2. Relevant equations 3. The attempt at a solution Not sure how to attempt this problem because there are 4 equations for two lines?