-4 + 6 = 2, so the high that day was 2 degrees. Since we're finding the high, and -4 is the low, it would not make sense for us to subtract 6 from -4, which would result in an even lower number. Thus, we add to find out the high.
Hope this helps! Have a great day :)
For the each of them simply substitute for x in each equation to see if you get the corresponding y , it doesnt really get any more straightforward than this
1. Given
2. Combine like terms
3. Subtraction POE (Property of Equality)
