Physical Science the table shows equivalent Fahrenheit and Celsius temperatures. 

Degrees Fahrenheit               Degrees Celsius

32 …………….................………………….. 0

68 ……………………................…….…… 20

104 …………………………...............….. 40

140 …………………………...............…... 60

176 ……………………..............………… 80

212 ……………………………............... 100

(a) Choose any two data points and use them to construct a linear equation that models the data, with x being Fahrenheit and y being Celsius. 

(b) Use the model in part (a) to find the Celsius temperature corresponding to 50 Degrees Fahrenheit and 75 Degrees Fahrenheit.