This was a question of social distancing. 🙂 b1 needed some time away from all of his friends; he needed to isolate himself.
We started with A = 1/2(b1 + b2)h. In order to get b1 all alone, we need to reverse the order of operations.
- 2A = (b1 + b2)h Move the 1/2 to the opposite side by multiplying by 2;
- 2A/h = b1 + b2 Move the h to the opposite side by dividing by h;
- 2A/h – b2 = b1 Move b2 to the opposite side by subtraction.