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

Solve for n. F = 4/3 ​(n-1) The solution is n= F+
Please help!! Due very soon!!
help me with this problem
What is the most important factor from a village to a city?
write this ratio as a fraction in simplest form without any unit 21 ft to 8 yards
x+2x=9what does x equal? and how do I get the answer?
Which of the following are acceptable ways to make one liter of 1 M NaCl? a) Put 1 liter of water into a container, then add 1 mole of NaCl and stir until the
How would you contrast the northern and southern positions on the annexation of texas?
A complex culture in which large numbers of human beings share common elements
how to simplify these equations