It is well known that to convert temperature in degrees Centigrade to temperature in degrees Fahrenheit, you do the following, in the specified order:
Multiply by 9; divide by 5; add 32.
Let x be temperature in degrees Centigrade, and let y be temperature in degrees Fahrenheit.
(a) According to the above rule, write down an equation which shows y as a function of x. Your equation should be the equation of a straight line. What is the intercept, and what is the slope?
(b) Sketch the line on a graph, with x
measured on the horizontal axis, and
y on the vertical.
(c) Use your equation to answer the
following:
(i) Water freezes at zero degrees
Centigrade. At what temperature
does water freeze in degrees
Fahrenheit?
(ii) Water boils at 100 degree Centigrade. At what temperature does water boil in degrees Fahrenheit?
(iii) “Absolute Zero” is the lowest temperature that it is theoretically possible to attain. It is -273 degrees Centigrade. What is Absolute Zero in degrees Fahrenheit?