Question

closed.

Answer 1

@itsmiranda

Original number in digit form xy means that x is in the tens slot and y is in the units slot.
The value of xy, then, is 10*x + 1*y

Reversed number in digit form yx means that y is now in the tens slot and x is in the units slot.

The value of yx, then, is 10*y + 1*x.

The sum of the digits of a two-digit number is 10.

1) x + y = 10

The difference of the original number and the number obtained by reversing the digits is 18.

2) 10*x + 1*y - (10*y + 1*x = 18

Answer 2

The two equations are:

1) x + y = 10
2) 10*x + 1*y - (10*y + 1*x) = 18

@itsmiranda Simplify the second equation to determine which option it is.