General ⇒ Special equation numbering

[pallav]

I am using the style:

Code: Select all

\begin{subequations}
\begin{align}
a_{11}& =b_{11}&
a_{12}& =b_{12}\\
a_{21}& =b_{21}&
a_{22}& =b_{22}+c_{22}
\end{align}
\end{subequations}

Here I get two lines with proper alignment where the equation numbers are 1.1a and 1.1b; the first for the first line and the second for 2nd line. But each line consists two equations. I need the equation numbering of the style below:

a11 = b11 a12 = b12 (1.1a, b)
a21 = b21 a22 = b22 + c22 (1.2a, b)

Please help me in this regard.