Question

quando um corpo está numa temperatura na escala fahrenheit excede em 2 unidades o dobro, da correspondente indicação na escala celsius essa temperatura é?

Answer 1

Tf = 2 + 2.Tc ⇒ Tc = (Tf -2)/2

Tc/5 = (Tf-32)/9
(Tf - 2)/10 = (Tf-32)/9
10.Tf - 320 = 9.Tf - 18
Tf = 302 ºF

Tc = (302-2)/2 = 300/2 = 150 ºC

Answer 2

$\tt 9tc\:=\:5\cdot \left(2tc\:-\:30\right)\\\\\\\tt 9tc=10ct-150\\\\\\\tt 9tc-10ct=10ct-150-10ct\\\\\\\tt -ct=-150\\\\\\\displaystyle \frac{-ct}{-t}=\frac{-150}{-t}\\\\\\\boxed{\tt C=150^\circ}$:)