# To convert a temperature in degrees Celsius to degrees Fahrenheit, multiply the Celsius temperature by 9/5 and then add 32^o. ls a temperature in degrees Celsius proportional to its equivalent temperature in degrees Fahrenheit?

Nov 25, 2016

No, a Celsius temperature is not proportional to its equivalent Fahrenheit temperature.

#### Explanation:

The formula is

$F = \frac{9}{5} C + 32$

$F$ increases as $C$ increases and $F$ decreases as $C$ decreases, but the relation is not a direct proportionality.

In mathematics, a direct proportion has the form

$y = m x$,

where $m$ is a constant.

$F = \frac{9}{5} C$

it would have been a direct proportion.

However, the addition of the $+ 32$ term makes the formula no longer a direct proportion.