Question

What is the formula for interchange rows in linear equation in one variable?

Answer 1

Suppose the unit's digit is x and tenth digit is y. The given number will be 10y+x.Since,Sum of the digits of a two-digit is number is 9. x+y=9. When we interchange the digits the new number wil be 10x+y. It is found that the resulting new number is greater than the original number by 27 So, 10x+y=10y+x+27. So, 9x-9y=27. x-y=3x+y=9 x=6.y=3. So, the given number is 10y+x=36. .