HELP PLEASE WHAT IS THE VERTEX

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?

This graph shows which inequality? a ≤ –3 a > –3 a ≥ –3 a < –3

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?