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

y = f(x) = -2X Find f(x) when x = 0.
Question 1 One out of every five cars made in the U.S. is red. What percent of the cars made in the U.S. are red? 20% 25% 50% 80%
the image below is the question
Would carving a dinosaur out of wood be a subtractive or additive sculpting method?
What is the y-intercept of y= -3x - 2
what does this dialogue reveal about Paul​
Carbon is allowed to diffuse through a steel plate 14-mm thick. The concentrations of carbon at the two faces are 0.680 and 0.129 kg of carbon per m3 of iron, w
en el lazarillo de tormes, ¿crees que este indigente (mendigo) fue un buen o un mal amo?
If you borrow $100 at 50% interest, how much interest do you think you will have to pay?
What type of wave has a frequency (Hz) Of 10 to the 18th power? If you know this, then please answer it for me. Thank you so, so much! *20 points*