a. (P/2) - w = l
- First you need to get the "l+w" alone. That side is divisible by 2 so you divide both sides of the equation by 2. The result is P/2 = l + w. Now you need to get the l by itself, so you just subtract w on both sides. There's your answer.
b. (2A/h) = b
- First you need to get rid of the 2 on the right side. To do this you multiply both sides of the equation by 2. The result is 2A = bh. Now all you have to do is divide both sides by h to get b by itself.
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