Tyrone2pon Tyrone2pon
  • 02-03-2017
  • Mathematics
contestada

The sum of the digits of a certain two-digit number is 7. Reversing its digits increases the number by 9.

Respuesta :

cartermike359
cartermike359 cartermike359
  • 02-03-2017
a + b = 7
10a + b + 9 = 10b + a

9a - 9b = -9
9a = 9b - 9
a = b - 1

Plugging back into the original equation:

(b - 1) + b = 7
2b - 1 = 7
2b = 8
b = 4
a = 3

34
Answer Link

Otras preguntas

The skeletal system does all of the following EXCEPT (A) support. (B) transport. (C) protect. (D) digest. (E) store.
What is 0.75 as a fraction in simplist form
A person sees a ball and kicks it, in part because of actions of the nervous system. Using the parts of the nervous system listed bellow, describe the path of n
The net force acting on a 50 kg crate is 0 N. What is the crate's acceleration
which is longer 635 millimeters or 535 centimeters ?
when gravity causes a huge amounts of rock or soil to be carried down a slope this form of erosion is referred to as a
What metric unit should i use to measure the mass of a monkey
How do you pronounce the letter "X" in Spanish?
Factor the polynomial 6b^2-17b+10
25% of what nember is 19