guerrerogi guerrerogi
  • 03-10-2017
  • Mathematics
contestada

anyone know how to do this one?
2x+7y=-1
4x-3y=-19

Respuesta :

choixongdong
choixongdong choixongdong
  • 03-10-2017
2x+7y=-1  (1)
4x-3y=-19 (2)

multiply equation (1) by 2
4x + 14y = -2 (1')
4x - 3y =  -19 (2)
---------------------subtract
17y = 17
 y = 1

2x+7y=-1
2x+7(1)=-1
2x + 7 = -1
2x = -8
  x = -4

answer
(-4, 1)
Answer Link

Otras preguntas

how much would a 185-pound astronaut weigh on the moon use an equation to explain how you know
Which pronoun agrees with the antecedent in the sentence? Most of the film wasn't as exciting as __________ beginning. A. its B. theirs C. their
Do you think women should have been able to vote based on the language in 15th Amendment? Why was it necessary to amend the Constitution by ratifying the 19th A
Which one of the following book titles is capitalized correctly?A. Harry Potter and the Sorcerer's Stone b. the Hunger Games c. The Fault In our Stars d. Bridg
Why does the sky changes color? Can you pleaseee explain me how it works? Thanks<3
"Mumbo-jumbo" means what ? a)strange ideas b)inspiring ideas c)verxing ideas d)promising ideas
Which of these numbers is between
What is the bronze age known for?
what would doula do for you and your partner
one fourth the difference of four sixths and three twelfths