why does the following work

```
solve([a+b-1,a-b],[a,b])
```

but this

```
solve([a+b-1,a-b,c+d],[a,b])
```

gives an empty solution?

Can "solve" be convinced to ignore unneccassary equations?

1 | initial version |

why does the following work

```
solve([a+b-1,a-b],[a,b])
```

but this

```
solve([a+b-1,a-b,c+d],[a,b])
```

gives an empty solution?

Can "solve" be convinced to ignore unneccassary equations?

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