Let us assume one number = x and Let us assume the other number to be = y Then x + y = 170 and x - y = 26 Adding the two equations, we get 2x = 196 x = 98 Putting the value of x in the first equation, we get x + y = 170 98 + y = 170 y = 170 - 98 = 72 The solution can be written as (98, 72). I hope the procedure is clear enough for you to understand.