Question

the sum of a two digit integer and the number obtained by reversing the order of its digits is 121 if the digits in units and tens place a x and y respectively Express this in the form of linear equation in two variables

Answer 1

The equation will be

$10y + x + 10x + y = 121$

$11x + 11y = 121$

$11(x + y) = 121$

$x + y = 11$