What is the justification for step 2 in the solution process? 12y - 40 - 4y = 6y - 18
Step 1: 8y - 40 = 6y - 18
Step 2: 2y - 40 = -18
is it a multiplication , subtraction , division , or addition property of equality ?

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?