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semisal
x = (9/5 x) + 32
x-9/5 x = 32
-4/5x = 32
x = 32 × -5/4
x = 8 x 5 = -40 derajat
tc = tf ... [1]
konversi dari skala C ke skala F
tf = ⁹/₅ tc + 32 ... [2]
substitusi [1] ke dalam [2]
tf = ⁹/₅ tc + 32
tc = ⁹/₅ tc + 32
tc - ⁹/₅ tc = 32
⁵/₅tc - ⁹/₅ tc = 32
- ⁴/₅ tc = 32
tc = 32 (- ⁵/₄)
tc = - 40º
jadi tc = tf = - 40º ← jawaban
cek
untuk tc = - 40 ºC
tf = ⁹/₅ tc + 32
tf = ⁹/₅ (- 40) + 32
tf = - 72 + 32
tF = - 40 ºF
untuk tf = - 40 ºC
tc = ⁵/₉ (tf - 32)
tc = ⁵/₉ (- 40 - 32)
tc = ⁵/₉ (- 72)
tc = - 40 ºC