TheN8RG8R TheN8RG8R
  • 01-11-2019
  • Mathematics
contestada

15. 5x – 2y = -19
8x + 5y = -55

Respuesta :

nguyenminhnguyet82
nguyenminhnguyet82 nguyenminhnguyet82
  • 02-11-2019

Answer:

x = -5

y = -3

Step-by-step explanation:

5x – 2y = -19  (1)

8x + 5y = -55 (2)

<=> 5(5x – 2y) = 5(-19)

2(8x + 5y) = 2(-55)

<=> 25x - 10y = -95 (3)

16x + 10y = -110 (4)

Add (3) and (4), we have:

25x - 10y + 16x + 10y = -95 -110

<=> 41x = -205

=> x = -5

Replace x = - 5 in (1), we have:

5(-5) – 2y = -19

<=> -25 - 2y = -19

=> y = [-25 - (-19)]/2 = -3

Answer Link

Otras preguntas

5. You are taking a math quiz and need to complete at least 10 Geometry problems and Algebra problems within 120 minutes. It will take you 15 minutes for each G
Which is the closest synonym for the word intrepid? A conservative B melancholy C dauntless D hapless
What are the factors of works?
The limits of the planned economy were conducted during the Cold War ?
why do water bodies evaporate. Plss I need help​
tom read 240 pages of a book that has 360 pages. what fraction of a book did he read
Water changes from state to state in the water cycle. Which of the following bestdescribes the process of the water cycle, which takes water from the clouds and
In the late 1800s, the homestead steel strike and the pullman railcar strike were unsuccessful mainly as a result of
3. Solve for x. 3r + 11 9x-14
Help me please, I'm begging you