$$ \begin{aligned} y &= \frac{3}{4}\cdot(-4)+3&& \text{multiply ALL terms by } \color{blue}{ 4 }. \\[1 em]4y &= 4 \cdot \frac{3}{4}\cdot(-4)+4\cdot3&& \text{cancel out the denominators} \\[1 em]4y &= -12+12&& \text{simplify right side} \\[1 em]4y &= 0&& \text{ divide both sides by $ 4 $ } \\[1 em]y &= \frac{0}{4}&& \\[1 em]y &= 0&& \\[1 em] \end{aligned} $$

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