We're going to compare positive or endothermic cube solution and negative or exothermicial solution. We're also going to compare non ideal situations we're presented to by dashed lines and ideal situations they're presented by solid lines. Now, in this graph, the y axis is vapor pressure and the x axis is the mole fraction. We're dealing with two compounds, compounds A, compound B. Compound B is the green line. Compound A is the brown line.