 Your Ultimate Guide to the Sankalana Vyavakanabhyam Sutra

The Sankalana Vyavakanabhyam is a popular Vedic Maths sutra used to solve linear equations in 2 variables. Literally meaning ‘addition and subtraction’, this 7th Vedic Maths sutra will help enthusiastic learners to breeze through linear equations. This article is dedicated to this wonderful method which will help you speed up your calculation and give accurate results. Check out other Vedic Maths lessons on the Podium Blog.

Only specific types of problems are solved with this method. For generic lengthy multiplication, look up the Nikhilam sutra and the Anurupyena sutra on the Podium blog.

Suppose we have a linear equation as:

ax+by= c1 (1)

bx+ay=c2  (2)

The linear equation should be such that, the coefficients are interchanged i.e. where x is a coefficient of a and y is a coefficient of b in equation (1), it is vice-versa in equation (2).

Let us try with some examples

EXAMPLE 1

5x – 4y = 34

4x – 5y =11

(5x-4y) + (4x-5y) = 34 +11

5x – 4y + 4y- 5y = 45

9x + 9y = 45

x + y = 45…..(i)

Subtraction –

(5x-4y) – (4x-5y) = 23

5x – 4y – 4x + 5y= 23

x + y = 23…..(ii)

x + y +x – y = 28 /  x – y – (x-y) =-18

x = 14                            -2y = -18

y = 18

Therefore, x = 14 and y = 18 and we have our equation solved!

EXAMPLE 2

45x + 23y = 113

23x + 45y = 91

(45x + 23y) + (23x + 45y) = 204

68x + 68y = 204

x + y = 204/68

x + y = 3…….(i)

Subtraction –

45x + 23y – (23x + 45y) = 22

45x + 23y  – 23x – 45y = 22

22x – 22y = 22

x – y = 1……(ii)

Taking (i) and (ii) together, we will repeat the addition and subtraction procedures till we get the desired values of x and y, respectively.

x + y + x – y = 4 (ADDITION)

Which implies to –

2x = 4

Therefore, x = 2

x + y – (x – y) = 2 (SUBTRACTION)

x + y – x + y =2

2y = 2

y = 1

More Practice

This Sutra is all about practice in solving linear equation in two variables. The more we practice it, the easier it gets and the more it allows and helps us to do quick math.

EXAMPLE 3

9x – 7y = 40

7x – 9y = 24

9x  – 7y + 7x – 9y  = 64

16x – 16y = 64

x + y = 4…..(i)

Subtraction –

9x – 7y – (7x – 9y) = 16

9x – 7y – 7x + 9y = 16

2x – 2y = 16

(Here we will divide both sides by 2 since it is the common co-coefficient on LHS and RHS)

Which leaves us with x– y =8….(ii)

Taking (i) and (ii) together, we will again repeat the addition and subtraction procedures till we get the desired values of x and y respectively.

x + y + x – y = 4 (ADDITION)

Which gives us-

2x = 4

Therefore, x = 2

x + y – (x – y) = 8 (SUBTRACTION)

x + y – x + y = 8

2y = 8

y = 4

Practicing Sankalana Vyavakanabhyamwith More Problems

EXAMPLE 4

69y – 5z = 42

5y – 69z = 32

69y – 5z + 5y – 69z = 74

74y – 74z = 74

x – y = 1…..(i)

Subtraction –

69y – 5z – (5y – 69z) = 74

69y – 5z – 5y + 69z = 74

y + z = 5/28……(ii)

Taking (i) and (ii) together, we will again repeat the addition and subtraction procedures till we get the desired values of x and y respectively.

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

EXAMPLE 5

1955x + 476y = 2482

476x + 1955y = – 4913

1955x + 476y + 476x + 1955y =  -2431

2431 x + 2431y = -2431

x + y = -1….(i)

Subtraction –

1955x + 476y – (476x +1955y) = -2431

1955x + 476y – 476x – 1955y = -2431

1479x + 1479y = 7395

x + y =5

Taking (i) and (ii) together, we will again repeat the addition and subtraction procedures till we get the desired values of x and y respectively.

x + y + x – y = 6 (ADDITION)

2x = 6

which gives us, x = 3

x + y – (x – y) = 4 (SUBTRACTION)

x + y – x + y = 4

2y = 4

y = 2

Our Last Practice Problem!

EXAMPLE 6

3x + 2y = 18

2x  + 3y = 17

3x + 2y + 2x + 3y = 35

5x + 5y = 35

x + y = 7…..(i)

Subtraction –

3x + 2y – (2x + 3y) = 1

3x + 2y – 2x + 3y= 1

x – y = 1……(ii)

Taking (i) and (ii) together, we will again repeat the addition and subtraction procedures till we get the desired values of x and y respectively.

x + y + x – y = 6 (ADDITION)

2x = 6

x = 3

x + y – (x – y) =  (SUBTRACTION)

2y = 4

y = 2