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

What three islands are located off the East African coast
A 1 digit number and a 3 digit number have a sum of 205.  The same two number have a difference of 195, a product of 1,000 and a quotient of 40.  What are the t
When was William Shakespeare born
A 1 digit number and a 3 digit number have a sum of 205.  The same two number have a difference of 195, a product of 1,000 and a quotient of 40.  What are the t
What is a direct combination reaction?
What is a direct combination reaction?
.is a pot holder a conductor or a insulator
If the speed of an object is tripled, its kinetic energy will be
What two major processes are involved in the oxygen cycle?
Nadine can send or receive a text message for 15 cents or get an unlimited number for 5 dollars. Write and solve an inequality to find how many messages she can