Consider two straight lines represented by y1=1-x1 and y2=1-x2. I want to calculate the ratio of these two lines i.e. y1/y2. The range of x1 and x2 is the same (say 0.5 to 1). So is the ratio of these two lines going to be a straight line or a curve with some other characteristics? How to analyse this ratio in detail for its characteristics (I mean minima and maxima etc.)?