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

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

por que se le llama “blue zone” a nicoya?

HELP PLEASE!!!! PLZ!!!

In the early 19th century Christian Doppler, an Austrian physicist, proposed a theory regarding the properties of a moving source of sound. This is now known as

Use the parabola tool to graph the quadratic function. f(x)=2x^2+12x+16

a 6lb watermelon costs $2.40 before a 30% discount. Which equation would allow you to find the discounted price of the watermelon?

Description of change to the ecosystem during hurricane katrina?

What is the main idea of this paragraph? A robot's job isn't limited to the terrestrial level, either. Even in space, machines such as the R2 humanoid robot at

what do you think max's book revealed about the power of words?

What is the equation of the line shown in this graph? Enter your answer in the box.

Which of the following is not a power of Congress? A. To establish post offices. B. To maintain postal roads. C. To maintain a state road. D. To issue a patent.