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Two variables, $\bm{x}$ and $\bm{y}$, are related such that for each increase of $\bm{1}$ in the value of $\bm{x}$, the value of $\bm{y}$ increases by a factor of 4. When $\bm{x}=0$, $\bm{y}=200$. Which equation represents this relationship?