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Chapter 19 - 19.4

4. (a) Let the reading on the Celsius scale be x and the reading on the Fahrenheit scale be y .Then

y =

2 x =

5 x +32 =

⇒

x = (5)(32) = 160 ◦ C

which yields y =2 x = 320 ◦ F.

(b) In this case,we require y =

2 x and ﬁnd

2 x =

5 x +32 =

⇒

x =

−

(10)(32)

13 ≈−

which yields y = x/ 2=

−

12 . 3 ◦ F.

5 x + 32. If we require y =2 x ,then we have

24 . 6 ◦ C