Help again please I am desperate

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28

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?

Find the solution to this system 2,1 1,-2 1,2 -1,2