I want to make an equation, but I can't get what I want on the correct lines

Question

$$\frac{\partial u}{\partial x}(x,y)=f(x,y,u(x,y))$$
$$\frac{\partial u}{\partial y}(x,y)=g(x,y,u(x,y))$$
$$u(x_0,y_0)=u_0$$

I want to write this but as an equation, I have tried

\begin{equation}
& =\frac{\partial u}{\partial x}(x,y)=f(x,y,u(x,y))\\
& =\frac{\partial u}{\partial y}(x,y)=g(x,y,u(x,y))\\
u(x_0,y_0)=u_0
\end{equation}

but can't get it to work.

Any feedback would be greatly appreciated

Ok thanks, but how do I get each statement onto individual lines, but for the entire equation to be marked as one equation. — Sam Houston, Jan 02 '15 at 14:17
Use aligned inside equation then. See: http://tex.stackexchange.com/a/171473/14757 — Sigur, Jan 02 '15 at 14:19

user69453 · Accepted Answer · 2015-01-02T16:07:41.903

2

Is this what you want:

\documentclass{scrreprt}
\usepackage{amsmath}
\begin{document}
 %(xyz) as a placeholder
 \begin{alignat}{2}
  (xyz) &= \frac{\partial u}{\partial x}(x,y) &&=f(x,y,u(x,y))\\
  (xyz) &= \frac{\partial u}{\partial y}(x,y) &&=g(x,y,u(x,y))\\
  (xyz) &= u(x_0,y_0) &&=u_0
\end{alignat}
\end{document}

enter image description here

edited Jan 02 '15 at 16:07

answered Jan 02 '15 at 14:26

user69453

936

Thanks for your answer, very close, just I wanted them all to be called one equation though. Ive worked out how to do it from Singur's comment above – Sam Houston Jan 02 '15 at 14:28
2

The space after equal sign is wrong since the correct use is &=. – Sigur Jan 02 '15 at 14:54
yes, i edited it... – user69453 Jan 02 '15 at 15:57
will you also post a new image to go with the modified code? – Mico Jan 02 '15 at 15:59
everything edited! – user69453 Jan 02 '15 at 16:11

I want to make an equation, but I can't get what I want on the correct lines

1 Answers1