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

In titanic, why was captain smith given command of the ship?
Germany took over what country after the Munich Conference from 1936-1941
what is the value of the expression? 4^3 • 4 ^−5 A. 4^−15 B. 4^−2 C. 4^2 D. 4^8 i thought it was d. but im not sure what to do to solve -_- PLEASE HELP!!
Write in vertex form: y = x2 - 4x - 1
what is the momentum of a parked car?
The ocean contains many plants and protists that can make their own food. What do these organisms get by living near the surface that they cannot get in deep wa
what are characteristics or traits of the bald eagle lead to the conclusion that bald eagles are predators that eat small prey
how many wars did edward I win
what is 66 2/3% in decimal form
What is the square route of 24