18.5 65.3
16.6 61.9
23.8 74.8
23.5 74.3

d5.3 9.5

Farenhite: t[F] = 9/5 * t[C] + 32

Celsius: t[C] = (t[F]-32)*5/9

y=kx+q
65.3 = 9/5*18.5 + q