What is the answer to this fraction problem 8 12/31+4 5/6

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

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

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2