For what ordered pair $(a,b)$ are there infinite solutions $(x,y)$ to the system \begin{align*}
2ax+2y&=b,\\
5x+y&=-3?
\end{align*}
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
For what ordered pair $(a,b)$ are there infinite solutions $(x,y)$ to the system \begin{align*}
2ax+2y&=b,\\
5x+y&=-3?
\end{align*}
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
(5,-6)
For what ordered pair $(a,b)$ are there infinite solutions $(x,y)$ to the system \begin{align*}
2ax+2y&=b,\\
5x+y&=-3?
\end{align*}
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