# \eqalign - Tex Command

## NAME

\eqalign - Used for equation alignment; for aligning multi-line displays at a single place.

## SYNOPSIS

{ \eqalign{ [itex] & [itex] \cr <repeat as needed> } }


## DESCRIPTION

\eqalign command is used for equation alignment; for aligning multi-line displays at a single place. The ampersand is placed where alignment is desired; a double-backslash can be used in place of the \cr ; the final \\ or \cr is optional; supports only a single \tag, which is vertically centered.

## EXAMPLE

1. \eqalign{
3x - 4y &= 5\cr
x  +  7 &= -2y
}

\eqalign{ 3x - 4y &= 5\cr x + 7 &= -2y }
2. \eqalign{
(a+b)^2 &= (a+b)(a+b) \\
&= a^2 + ab + ba + b^2 \\
&= a^2 + 2ab + b^2
}

\eqalign{ (a+b)^2 &= (a+b)(a+b) \\ &= a^2 + ab + ba + b^2 \\ &= a^2 + 2ab + b^2 }
3. \left\{
\eqalign{
a &= 1\\
b &= 2\\
c &= 3
}\right\}

\left\{ \eqalign{ a &= 1\\ b &= 2\\ c &= 3 }\right\} \qquad \eqalign{ ax + by &= c \\ x + 2y &= 3 }