Answer
$$ y =4x-12$$
Work Step by Step
Given $$ x=t+3,\ \ \ \ y=4t $$
Then $ t=x-3$, hence
\begin{align*}
y&=4t\\
&=4(x-3)\\
&=4x-12
\end{align*}
i.e
$$ y =4x-12$$
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