# Aligned derivations

The `aligned` environment lines up equations at each `&`. End a line with `\\`.

```latex
\begin{aligned}
(a+b)^2
  &= (a+b)(a+b)\\
  &= a^2+ab+ba+b^2\\
  &= a^2+2ab+b^2.
\end{aligned}
```

```latex
\begin{aligned}
y &= mx+b\\
y-b &= mx\\
x &= \frac{y-b}{m}.
\end{aligned}
```