\(-4x=7y\Leftrightarrow\dfrac{x}{7}=\dfrac{y}{-4}\)
Áp dụng t/c dtsbn ta có:
\(\dfrac{x}{7}=\dfrac{y}{-4}=\dfrac{y-x}{-4-7}=\dfrac{44}{-11}=-4\)
\(\dfrac{x}{7}=-4\Rightarrow x=-28\\ \dfrac{y}{-4}=-4\Rightarrow y=16\)
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