Question

a two digit number is such that the sum of the digit is 4. if 8 is added to the number ,its difit are reserved .find the number

Answer 1

let the numbers be x and x
x +y=4
and
xy+8=yx
from 1ts eq x=4-y
put that in2nd
4-y) y+8=4-y) y
4y-ysq+8=4y-ysq


what is mean by difit i dont get it