Sankalana - Vyavakalanabhyam:
By addition and by subtraction
Sankalana - Vyavakalanabhyam is the seventh
sutra of
Vedic mathematics. Its corollary is
Yavadunam Tavadunikritya Varga Yojayet.
This sutra, like
Anurupye - Shunyamanyat, is used for solving simultaneous equations. This sutra is used when the
coefficient are interchanged. I'll give an example:
Solve for y and z in the following equations in which y and z remain
constant:
69y - 5z = 42
5y - 69z = 32
Notice that the y-coefficients and the z-coefficients (69 and 5) are interchanged.
There are three steps by which this sutra can be used to solve for y and z:
Step One: Addition:
(69y - 5z)
+ (5y - 69z) = 42
+ 32
This can be simplified to 74y - 74z = 74
Now divide 70 by 74 to simplify the equation to
y - z = 1 This will be used in the next step.
Step Two: Subtraction:
(69y - 5z)
- (5y - 69z) = 42
- 32
Simply this to 56y - -56z = 10
56y + 56z = 10
y + z = 5/28
Step Three: We can now use these two equations from steps one and two to solve for y and z
y = 1 + z = 5/28 - z
1 + z = 5/28 - z
1 + 2z = 5/28
2z = -23/28
z = (-23/28)/2
z = -23/56
Therefore, y = 5/28 - -23/56
y = 10/56 + 23/56
y = 33/56
To see more examples of this sutra, view the resources below:
RESOURCES:
Vedic Mathematics by Sri Bharati Krisna Tirthaji
http://www.vedamu.org/Mathematics/course.asp
http://www.sanalnair.org/articles/vedmath/intro.htm
http://www.vedicganita.org/ganitsutras.htm
http://hinduism.about.com/library/weekly/aa062901a.htm
http://www.vedicmaths.org/
http://www.hinduism.co.za/vedic.htm
Mathemagics by Arthur Benjamin and Michael B. Shermer
http://en.wikipedia.org/wiki/Vedic_math
http://www.tifr.res.in/~vahia/dani-vmsm.pdf
http://www.sacw.net/DC/CommunalismCollection/ArticlesArchive/NoVedic.html