Question
$$-5 = \frac{y}{8}$$
Answer
$$ y = -40 $$
Explanation
$$ \begin{aligned} -5 &= \frac{y}{8}&& \text{multiply ALL terms by } \color{blue}{ 8 }. \\[1 em]8\cdot(-5) &= 8 \cdot \frac{y}{8}&& \text{cancel out the denominators} \\[1 em]-40 &= y&& \text{ swap the left and right side of the equation } \\[1 em]y &= -40&& \\[1 em]y &= -40&& \\[1 em] \end{aligned} $$
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