# latex – How do you align a system of equations?

## latex – How do you align a system of equations?

There is a package `systeme`

for systems of linear equations with automatic alignment of the variables and values – it even detects the variables for you.

In the standard set-up use you would just write

```
begin{equation*}
systeme{
x+y+z = 1,
x+y+z = frac{5}{2},
x+y+z = 5
}
end{equation*}
```

or

```
begin{equation*}
systeme{
3x +7z = 20,
y - 17z = -3,
24x + 15y = 7
}
end{equation*}
```

which may or may not suit your taste. The bracket can removed by specifying empty delimiters by preceding the `systeme`

command with

```
sysdelim..
```

(`.`

is an empty place holder, `sysdelim`

needs two as it specifies a left and a right delimiter).

To make the fraction bigger you can use `dfrac`

from the `amsmath`

package (which you are already loading), but then you have to help with the line spacing:

```
documentclass{article}
usepackage{amsmath,systeme}
begin{document}
begin{equation*}
systeme{
x+y+z = 1,
x+y+z = frac{5}{2},
x+y+z = 5
}
end{equation*}
No delimeter, displaystyle fraction and line spacing
begin{equation*}
sysdelim..systeme{
x+y+z = 1,
x+y+z = dfrac{5}{2}rule[-3ex]{0pt}{7ex},
x+y+z = 5
}
end{equation*}
end{document}
```

Alternatively extra spacing can be added between all lines via the command `syslineskipcoeff`

which is a scaling factor:

```
documentclass{article}
usepackage{amsmath,systeme}
begin{document}
No delimeter, displaystyle fraction and line spacing
begin{equation*}
sysdelim..syslineskipcoeff{2}systeme{
x+y+z = 1,
x+y+z = dfrac{5}{2},
x+y+z = 5
}
end{equation*}
end{document}
```

Use `&=`

to signify to align with the equals:

```
begin{align*}
x+y+z &= ,1 \
x+y+z &= frac{5}{2} \
x+y+z &= ,5
end{align*}
```

You can use these in math mode:

`; - a thick space : - a medium space , - a thin space <-- used this here in front of the simple numbers ! - a negative thin space`

Source: http://www.emerson.emory.edu/services/latex/latex_119.html

You can reread about `align*`

environment f.e. here: https://en.wikibooks.org/wiki/LaTeX/Advanced_Mathematics#align_and_align*

#### latex – How do you align a system of equations?

Simply adding `&`

before each line results in the desired output.

```
begin{align*}
&x+y+z=1 \
&x+y+z=frac{5}{2} \
&x+y+z=5
end{align*}
```