Topic: AREA OF COMPOSITE FIGURES.. please help with this it’s due in 2 days

What term makes it inconsistent y=2x - 4 ?

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

Ineed to know the answer to this algebra question.