Answer:
Unit conversion between Rankine and Kelvin is linear.
Unit conversion between degree Celsius and degree Fahrenheit is linear.
Step-by-step explanation:
Relation between rankine and Kelvin is

So, the plot between Rankine and Kelvin is a straight line with zero intercept and has a slope having value
.
Relation between degrees Celsius and degrees Fahrenheit is given by

So, the plot between degrees Celsius and degrees Fahrenheit is a straight line with slope
and negative intercept of
.