Alternative Equation Formats

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MathML

\begin{aligned} y_{t} & = μ + δ t + r_{t} + u_{t} \\ r_{t} & = r_{t - 1} + e_{t} \end{aligned}

\begin{align*} y_ t & =\mu +\delta t+r_ t+u_ t\\ r_ t & =r_{t-1}+e_ t \end{align*}