Which math tool am I supposed to use to solve this system?**
Given these coefficients , which is the combination of $(x , y , d)$ that satisfies these equations?
$$ \left\{ \begin{aligned} 5x+7y &=d \\ 2x+y&=d\\ \end{aligned} \right. $$
2026-04-29 06:59:38.1777445978
What math tool am I suppose to use?
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$ \left\{ \begin{aligned} 5x+7y &=d \\ 2x+y&=d\\ \end{aligned} \right. $ $\Leftrightarrow $ $ \left\{ \begin{aligned} 5x+7y &=d \\ 14x+7y&=7d\\ \end{aligned} \right. $ $\Rightarrow 9x=6d \Rightarrow x=\frac{2}{3}d \Rightarrow y=-\frac{1}{3}d$