- Choice A\begin{align*} 4x+7y=9 \\ \Rightarrow 7y=-4x+9 \\ \Rightarrow y=-\frac {4}{7}x+\frac {9}{7} \\ \Rightarrow Slope =-\frac {4}{7} \end{align*}
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- Choice A\begin{align*} 4x+7y=9 \\ \Rightarrow 7y=-4x+9 \\ \Rightarrow y=-\frac {4}{7}x+\frac {9}{7} \\ \Rightarrow Slope =-\frac {4}{7} \end{align*}
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