Final answer:
When vapor pressure is plotted against temperature, the resulting line is a straight line that represents the relationship between vapor pressure and temperature.
Step-by-step explanation:
When vapor pressure is plotted against temperature, the resulting line is a straight line. This is because the equation for vapor pressure versus temperature is in the form of a straight line equation, y = mx + b. The line passes through the origin (b=0) and represents the relationship between vapor pressure and temperature.