Write an expression to show the number a and the number b decreased by 12

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label

Pls brainliest will be awarded if answer is correct

Write two point-slope equations for the line passing through the points (6, 5) and (3, 1)