Question

function f(x) = 5/9(x-32) converts Fahrenheit temperatures into Celsius. What is the function for opposite conversion?

Answer 1

Let $f(x)=y$

$\therefore$ $y=\frac{5}{9}(x-32)$

$\implies 9y=5x-160 \implies9y+160=5x$

$\implies x=\frac{1}{5}(9y+160)$ $=\frac{9}{5}y+32$

Therefore the opposite function ,which convert Celsius to Fahrenheit is $\frac{9}{5}y+32$ ,where y is the temperature in Celsius. i,e,

$x°C,(\frac{9}{5}x+32)°F$