Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

krissywatts

solve system of equation: x+y=-1 y-z=4 2x+y+5z=-38 i need step by step help please?

  • one year ago
  • one year ago

  • This Question is Closed
  1. Kanwar245
    Best Response
    You've already chosen the best response.
    Medals 1

    step1; multiply equation 1 with -1

    • one year ago
  2. Kanwar245
    Best Response
    You've already chosen the best response.
    Medals 1

    step2; add equation 1 and equation 2

    • one year ago
  3. Kanwar245
    Best Response
    You've already chosen the best response.
    Medals 1

    you'll get an equation in terms of x and z

    • one year ago
  4. krissywatts
    Best Response
    You've already chosen the best response.
    Medals 0

    so my finale for that would be -x-z=4 correct?

    • one year ago
  5. krissywatts
    Best Response
    You've already chosen the best response.
    Medals 0

    @Kanwar245

    • one year ago
  6. Kanwar245
    Best Response
    You've already chosen the best response.
    Medals 1

    -x - z = 5

    • one year ago
  7. krissywatts
    Best Response
    You've already chosen the best response.
    Medals 0

    yes sorry

    • one year ago
  8. krissywatts
    Best Response
    You've already chosen the best response.
    Medals 0

    no what is the next step?

    • one year ago
  9. krissywatts
    Best Response
    You've already chosen the best response.
    Medals 0

    now*

    • one year ago
  10. Kanwar245
    Best Response
    You've already chosen the best response.
    Medals 1

    also you can rewrite last equation as 2x + 4 + z + 5z = -38

    • one year ago
  11. Kanwar245
    Best Response
    You've already chosen the best response.
    Medals 1

    2x + 6z = -42 or x + 2z = 31

    • one year ago
  12. Kanwar245
    Best Response
    You've already chosen the best response.
    Medals 1

    and you have -x -z = 5

    • one year ago
  13. Kanwar245
    Best Response
    You've already chosen the best response.
    Medals 1

    solve these two equations

    • one year ago
  14. krissywatts
    Best Response
    You've already chosen the best response.
    Medals 0

    okay

    • one year ago
  15. Kanwar245
    Best Response
    You've already chosen the best response.
    Medals 1

    you get z = 26

    • one year ago
  16. Kanwar245
    Best Response
    You've already chosen the best response.
    Medals 1

    x = -31

    • one year ago
  17. krissywatts
    Best Response
    You've already chosen the best response.
    Medals 0

    is y 30?

    • one year ago
  18. krissywatts
    Best Response
    You've already chosen the best response.
    Medals 0

    @Kanwar245

    • one year ago
  19. krissywatts
    Best Response
    You've already chosen the best response.
    Medals 0

    @campbell_st

    • one year ago
  20. krissywatts
    Best Response
    You've already chosen the best response.
    Medals 0

    @agent0smith

    • one year ago
  21. agent0smith
    Best Response
    You've already chosen the best response.
    Medals 0

    Assuming Kanwar245 is correct, z = 26 x = -31 to find y, use these values in one of these equations to find y: x+y=-1 y-z=4 2x+y+5z=-38 from the first, x+y=-1, so \[\large y = -1 - x = -1 - (-31) = 30 \]. or use the second, y-z=4, so \[\large y= 4+z = 4+26 = 30\] or use the third, 2x+y+5z=-38, so \[y = -38 -2x -5z = -38 -2(-31)-5(26) = -106\] This doesn't agree with the other value for y of 30, so it's possible there's a mistake somewhere.

    • one year ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.