taytay72 taytay72
  • 26-04-2017
  • Mathematics
contestada

Elimination method for x+7y=0 and 2x-8y=22

Respuesta :

Аноним Аноним
  • 26-04-2017

 2x - 8y = 22
-2(x + 7y = 0)

 2x - 8y = 22
-2x - 14y = 0
------------------
        -22y = 22
              y = -1

substitute y into one of the previous equations to find x.

x + 7y = 0
x + 7(-1) = 0
x - 7 = 0
      x = 0 + 7
      x = 7

(-7, -1)

Check.

7 + 7(-1) = 0
7 - 7 = 0

2(7) - 8(-1) = 22
14  + 8 = 22

hope this helps :)


























Answer Link

Otras preguntas

Explain how you know...?
50 inches In 5 hours, how many inches in one hour
2 [ 32 - (4-1) to the third power ]
What advice would you give Percy? Support your answer with evidence. help pls it's due today ​
What is the answer for 9 3/5 / 3 1/5
Alright fam, help me out here with these angles thanks!
Part A How do paragraphs 1 and 2 contribute to the overall structure of "Assignment Day"? They establish the challenging living conditions that affect the chara
How much longer is the Nile than each of the three major rivers of South Asia?
Please help me solve this Sorry if the quality is bad
Conodonts in a sedimentary rock layer change color from dark to translucent-white. How will the sedimentary rock layer be affected if the burial continues?