How do I write a system of equations with dots in latex?

[haseebmahmud]

Hi Folks,

I want to write a system of equations in latex. The equations is something similar as follows,

http://farm4.static.flickr.com/3081/2466547973_636ea6137f_o.jpg

Generally, its ok to write system of equations in latex. But i don't have any idea how can I place the dots like what you see in the picture attached.

Any help would be greatly appreciated.

Thanks in advance.

_HM

 

[CompuChip]

Something like this?
$$\begin{align*} y_1 a_{11} & + & y_2 a_{21} & + & \cdots & + & e_1 & = & 0 \\ y_1 a_{12} & + & y_2 a_{22} & + & \cdots & + & e_2 & = & 0 \\ \vdots & & \vdots & & & & \vdots& & \\ y_1 a_{1M} & + & y_2 a_{2M} & + & \cdots & + & e_M & = & 0 \\ \end{align*}$$

(click to see source)

 

[haseebmahmud]

gr8. that's exactly what i am looking for. i googled a lot but didnt find the exact. thanks again. anyway could you please tell me how should i write vdots. I mean the spacing.