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

Which word in the sentence is the appositive? My older sister Maria is learning how to drive a car. A. sister B. learning C. Maria D. car
The Middle Colonies were most known for its what of different religions?
Is this a good thesis statement for my essay? The Earth has many life-threatening problems caused by humans. One of these problems is the over-consumption of w
Log4(6x-8)=3 Help please
what is the theory that tax cuts can raise supply called
A cable is lifting a construction worker and a crate. The weights of the worker and crate are 965 N and 1510 N, respectively. The acceleration of the cable is
what are the similarities between insects and humans
An oak tree that is 220 years old produced acorns at two different rates. Until it reached maturity, it produced an average of 900 acorns a year. However, once
What is party-as-organization?
How do you derive the drift velocity equation (I = nAve)?