The graph between two temperature scales A and B is shown in figure. Between upper fixed point and lower fixed point there are 150 equal divisions on scale A and 100 on scale B. The relationship for conversion between the two scales is given by

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From the graph, the lower fixed point is $3 0^{\circ}$ on scale A (the upper one is $18 0^{\circ}$ ) and $0^{\circ}$ on scale B.
Fixed-point intervals:
$Δ t_{A} = 180 - 30 = 150$
$Δ t_{B} = 100$
$\frac{t _{A} - 30}{150} = \frac{t _{B} - 0}{100}$
$\frac{t _{A} - 30}{150} = \frac{t _{B}}{100}$

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