$$8\cdot(8+y) = 100$$
Answer
$$ y = \frac{9}{2} $$
Explanation
$$ \begin{aligned} 8\cdot(8+y) &= 100&& \text{simplify left side} \\[1 em]64+8y &= 100&& \\[1 em]8y+64 &= 100&& \text{ move 64 to the right } \\[1 em]8y &= 100-64&& \\[1 em]8y &= 36&& \text{ divide both sides by $ 8 $ } \\[1 em]y &= \frac{36}{8}&& \\[1 em]y &= \frac{9}{2}&& \\[1 em] \end{aligned} $$
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