15-b=7.
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Divide both sides by -3: b = 24/(-3) = -8
The second equation is not complete and there is not sufficient information for a solution. It would make no sense for me to guess what a + b equals since, in that case, I may as well start posting my own questions and answering them!
12
It isn't always. In fact, it almost never is. The only time it is is when 'b' is 22/3 .
-7+3b = 4b-8 3b-4b = -8+7 -b = -1 b = 1