I need help asap I will give 15 points if it’s right

What is the result of adding the system of equations? 2x+y=4 3x-y=6

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?

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?