#### How to use solver to solve for 2 unknown in a linear equation?

```How to use Excel to solve for 2 unknown in linear equation, for eg,

x + Y = 1
3x + 4Y =7

Thanks
Mike
```
 0
Mike1154 (1216)
2/17/2009 3:43:57 AM
excel.newusers 15348 articles. 2 followers.

9 Replies
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```One way:

A1:      1
B1:      1
C1:      =A1 + B1
D1:      =3*A1 + 4*B1

Set Target Cell = D1
Equal to Value of 7
By changing cells: A1:B1
Subject to the Constraints: \$C\$1 = 1

In article <84B8D8D5-95FE-41E1-B55C-B0850F5FB06B@microsoft.com>,
Mike <Mike@discussions.microsoft.com> wrote:

> How to use Excel to solve for 2 unknown in linear equation, for eg,
>
> x + Y = 1
> 3x + 4Y =7
>
> Thanks
> Mike
```
 0
jemcgimpsey (6723)
2/17/2009 4:43:40 AM
```Solver. Does it mean "Goal Seak" in Excel 2003?
XL2003 does not have the "Subject to the Constraints": \$C\$1 = 1
Where is the "Subject to the Constraints"?
--
R. Khoshravan

"JE McGimpsey" wrote:

> One way:
>
> A1:      1
> B1:      1
> C1:      =A1 + B1
> D1:      =3*A1 + 4*B1
>
>
> Set Target Cell = D1
> Equal to Value of 7
> By changing cells: A1:B1
> Subject to the Constraints: \$C\$1 = 1
>
>
>
>
> In article <84B8D8D5-95FE-41E1-B55C-B0850F5FB06B@microsoft.com>,
>  Mike <Mike@discussions.microsoft.com> wrote:
>
> > How to use Excel to solve for 2 unknown in linear equation, for eg,
> >
> > x + Y = 1
> > 3x + 4Y =7
> >
> > Thanks
> > Mike
>
```
 0
khoshravan (78)
2/17/2009 5:10:00 AM
```No, Goal Seek is not the same as Solver.
Solver is an add-in. It has to be activated: Tools>Add-ins, check Solver

--
Kind regards,

Niek Otten
Microsoft MVP - Excel

"Khoshravan" <Khoshravan@discussions.microsoft.com> wrote in message
news:8FC9F7E8-3392-4C75-B7EB-14F22069CEF8@microsoft.com...
> Solver. Does it mean "Goal Seak" in Excel 2003?
> XL2003 does not have the "Subject to the Constraints": \$C\$1 = 1
> Where is the "Subject to the Constraints"?
> --
> R. Khoshravan
>
>
> "JE McGimpsey" wrote:
>
>> One way:
>>
>> A1:      1
>> B1:      1
>> C1:      =A1 + B1
>> D1:      =3*A1 + 4*B1
>>
>>
>> Set Target Cell = D1
>> Equal to Value of 7
>> By changing cells: A1:B1
>> Subject to the Constraints: \$C\$1 = 1
>>
>>
>>
>>
>> In article <84B8D8D5-95FE-41E1-B55C-B0850F5FB06B@microsoft.com>,
>>  Mike <Mike@discussions.microsoft.com> wrote:
>>
>> > How to use Excel to solve for 2 unknown in linear equation, for eg,
>> >
>> > x + Y = 1
>> > 3x + 4Y =7
>> >
>> > Thanks
>> > Mike
>>

```
 0
nicolaus (2022)
2/17/2009 10:04:18 AM
```Thanks. After adding will it appear in Tools menu or elsewhere? I added but
it didn't appear in tools menu.
--
R. Khoshravan

"Niek Otten" wrote:

> No, Goal Seek is not the same as Solver.
> Solver is an add-in. It has to be activated: Tools>Add-ins, check Solver
>
> --
> Kind regards,
>
> Niek Otten
> Microsoft MVP - Excel
>
> "Khoshravan" <Khoshravan@discussions.microsoft.com> wrote in message
> news:8FC9F7E8-3392-4C75-B7EB-14F22069CEF8@microsoft.com...
> > Solver. Does it mean "Goal Seak" in Excel 2003?
> > XL2003 does not have the "Subject to the Constraints": \$C\$1 = 1
> > Where is the "Subject to the Constraints"?
> > --
> > R. Khoshravan
> >
> >
> > "JE McGimpsey" wrote:
> >
> >> One way:
> >>
> >> A1:      1
> >> B1:      1
> >> C1:      =A1 + B1
> >> D1:      =3*A1 + 4*B1
> >>
> >>
> >> Set Target Cell = D1
> >> Equal to Value of 7
> >> By changing cells: A1:B1
> >> Subject to the Constraints: \$C\$1 = 1
> >>
> >>
> >>
> >>
> >> In article <84B8D8D5-95FE-41E1-B55C-B0850F5FB06B@microsoft.com>,
> >>  Mike <Mike@discussions.microsoft.com> wrote:
> >>
> >> > How to use Excel to solve for 2 unknown in linear equation, for eg,
> >> >
> >> > x + Y = 1
> >> > 3x + 4Y =7
> >> >
> >> > Thanks
> >> > Mike
> >>
>
```
 0
khoshravan (78)
2/17/2009 10:44:03 AM
```Yes, it should show in the Tools menu

--
Kind regards,

Niek Otten
Microsoft MVP - Excel

"Khoshravan" <Khoshravan@discussions.microsoft.com> wrote in message
news:D6998368-D400-4F85-9CB5-C3BF1614EEFD@microsoft.com...
> but
> it didn't appear in tools menu.
> --
> R. Khoshravan
>
>
> "Niek Otten" wrote:
>
>> No, Goal Seek is not the same as Solver.
>> Solver is an add-in. It has to be activated: Tools>Add-ins, check Solver
>>
>> --
>> Kind regards,
>>
>> Niek Otten
>> Microsoft MVP - Excel
>>
>> "Khoshravan" <Khoshravan@discussions.microsoft.com> wrote in message
>> news:8FC9F7E8-3392-4C75-B7EB-14F22069CEF8@microsoft.com...
>> > Solver. Does it mean "Goal Seak" in Excel 2003?
>> > XL2003 does not have the "Subject to the Constraints": \$C\$1 = 1
>> > Where is the "Subject to the Constraints"?
>> > --
>> > R. Khoshravan
>> >
>> >
>> > "JE McGimpsey" wrote:
>> >
>> >> One way:
>> >>
>> >> A1:      1
>> >> B1:      1
>> >> C1:      =A1 + B1
>> >> D1:      =3*A1 + 4*B1
>> >>
>> >>
>> >> Set Target Cell = D1
>> >> Equal to Value of 7
>> >> By changing cells: A1:B1
>> >> Subject to the Constraints: \$C\$1 = 1
>> >>
>> >>
>> >>
>> >>
>> >> In article <84B8D8D5-95FE-41E1-B55C-B0850F5FB06B@microsoft.com>,
>> >>  Mike <Mike@discussions.microsoft.com> wrote:
>> >>
>> >> > How to use Excel to solve for 2 unknown in linear equation, for eg,
>> >> >
>> >> > x + Y = 1
>> >> > 3x + 4Y =7
>> >> >
>> >> > Thanks
>> >> > Mike
>> >>
>>

```
 0
nicolaus (2022)
2/17/2009 11:09:01 AM
```I installed (Add) the solver and solved the set of 2 equations by the method
mentioned by  JE McGimpsey. A very nice solution and I was unaware of
handling of set of eq. by excel.
In an extension to above question, is it possible to solve let say a set of
5 equations with 5 unknowns by the same method  of JE McGimpsey ? What is the
limit of solver for handling such set of eq.
--
R. Khoshravan

"Niek Otten" wrote:

> Yes, it should show in the Tools menu
>
> --
> Kind regards,
>
> Niek Otten
> Microsoft MVP - Excel
>
> "Khoshravan" <Khoshravan@discussions.microsoft.com> wrote in message
> news:D6998368-D400-4F85-9CB5-C3BF1614EEFD@microsoft.com...
> > but
> > it didn't appear in tools menu.
> > --
> > R. Khoshravan
> >
> >
> > "Niek Otten" wrote:
> >
> >> No, Goal Seek is not the same as Solver.
> >> Solver is an add-in. It has to be activated: Tools>Add-ins, check Solver
> >>
> >> --
> >> Kind regards,
> >>
> >> Niek Otten
> >> Microsoft MVP - Excel
> >>
> >> "Khoshravan" <Khoshravan@discussions.microsoft.com> wrote in message
> >> news:8FC9F7E8-3392-4C75-B7EB-14F22069CEF8@microsoft.com...
> >> > Solver. Does it mean "Goal Seak" in Excel 2003?
> >> > XL2003 does not have the "Subject to the Constraints": \$C\$1 = 1
> >> > Where is the "Subject to the Constraints"?
> >> > --
> >> > R. Khoshravan
> >> >
> >> >
> >> > "JE McGimpsey" wrote:
> >> >
> >> >> One way:
> >> >>
> >> >> A1:      1
> >> >> B1:      1
> >> >> C1:      =A1 + B1
> >> >> D1:      =3*A1 + 4*B1
> >> >>
> >> >>
> >> >> Set Target Cell = D1
> >> >> Equal to Value of 7
> >> >> By changing cells: A1:B1
> >> >> Subject to the Constraints: \$C\$1 = 1
> >> >>
> >> >>
> >> >>
> >> >>
> >> >> In article <84B8D8D5-95FE-41E1-B55C-B0850F5FB06B@microsoft.com>,
> >> >>  Mike <Mike@discussions.microsoft.com> wrote:
> >> >>
> >> >> > How to use Excel to solve for 2 unknown in linear equation, for eg,
> >> >> >
> >> >> > x + Y = 1
> >> >> > 3x + 4Y =7
> >> >> >
> >> >> > Thanks
> >> >> > Mike
> >> >>
> >>
>
>
```
 0
khoshravan (78)
2/17/2009 3:27:03 PM
```From XL Help ("Options in the Solver Add Constraint and Change
Constraint dialog boxes"):

For linear problems, there is no limit on the
number of constraints.

In article <4C41E439-96A1-4E9E-86A9-2A7D8817A108@microsoft.com>,
Khoshravan <Khoshravan@discussions.microsoft.com> wrote:

> What is the
> limit of solver for handling such set of eq.
```
 0
jemcgimpsey (6723)
2/17/2009 5:37:20 PM
```Why not clear the target cell and use two constraints:
C1=1
D1=7
It really is the best way - I have a worksheet to demo this if interested
best wishes
--
Bernard V Liengme
Microsoft Excel MVP
http://people.stfx.ca/bliengme
remove caps from email

"JE McGimpsey" <jemcgimpsey@mvps.org> wrote in message
news:jemcgimpsey-008CEA.21434016022009@news.microsoft.com...
> One way:
>
> A1:      1
> B1:      1
> C1:      =A1 + B1
> D1:      =3*A1 + 4*B1
>
>
> Set Target Cell = D1
> Equal to Value of 7
> By changing cells: A1:B1
> Subject to the Constraints: \$C\$1 = 1
>
>
>
>
> In article <84B8D8D5-95FE-41E1-B55C-B0850F5FB06B@microsoft.com>,
> Mike <Mike@discussions.microsoft.com> wrote:
>
>> How to use Excel to solve for 2 unknown in linear equation, for eg,
>>
>> x + Y = 1
>> 3x + 4Y =7
>>
>> Thanks
>> Mike

```
 0
bliengme5824 (3040)
2/17/2009 7:46:18 PM
```Thanks
--
R. Khoshravan

"JE McGimpsey" wrote:

> From XL Help ("Options in the Solver Add Constraint and Change
> Constraint dialog boxes"):
>
>      For linear problems, there is no limit on the
>      number of constraints.
>
>
> In article <4C41E439-96A1-4E9E-86A9-2A7D8817A108@microsoft.com>,
>  Khoshravan <Khoshravan@discussions.microsoft.com> wrote:
>
> > What is the
> > limit of solver for handling such set of eq.
>
```
 0
khoshravan (78)
2/17/2009 9:43:02 PM

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