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

phury

solve using substitution, show work -4x + y = 6 -5x - y = 21

  • one year ago
  • one year ago

  • This Question is Closed
  1. KAOS|abdullah
    Best Response
    You've already chosen the best response.
    Medals 0

    find x in terms of y in 1st eqn. ,substitute in the 2nd eqn. and u get the value of y...equate that and u get the value of x

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

    example?

    • one year ago
  3. shaik0124
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1358532187958:dw|

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

    i am sorry, i have no idea what that says.

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

    take 2 any equations like 2x+3y=11---(1) and 3x+5y=12----(2) .....from (1) u can find that x=(11-3y)/2...substitute this x value in eqn. (2) and solve...u'll get the value of y

    • one year ago
  6. shaik0124
    Best Response
    You've already chosen the best response.
    Medals 1

    -9x-27=0 -9x=27 x=-3 now u get y by substuting x value in any one of the equations

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

    and then substitute that value of y in eqn (1) or (2) and get the value of x

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

    i understabd substituting the final value, i just have to get it first. i dont know how to solve -4x + y = 6

    • one year ago
  9. shaik0124
    Best Response
    You've already chosen the best response.
    Medals 1

    what i have done is i got the value of y from 2nd equation and substituted in first so by substituting y in 1st equation u will get equation in x terms from u will get x value and substitute x value in any equation and get y

    • one year ago
  10. shaik0124
    Best Response
    You've already chosen the best response.
    Medals 1

    just add+4x on both sides then u will get y|dw:1358532633268:dw|

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

    yeah, i got y = 6 + 4x

    • one year ago
  12. shaik0124
    Best Response
    You've already chosen the best response.
    Medals 1

    now u substitute y value in the other equation and u will get the equation in x terms ok do this

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

    -5x + 6 + 4x

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

    -5x + 6 + 4x = 21 -1x + 6 = 21 -1x = 15 x = -15 ?

    • one year ago
  15. shaik0124
    Best Response
    You've already chosen the best response.
    Medals 1

    no it is -5x+4x-6=21 now solve

    • one year ago
  16. shaik0124
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1358533659839:dw|

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

    move the 6 and 4x and the operation changes? thought i forgot something -5x + 4x - 6 = 21 -1x - 6 = 21 -1x = 26 x = -26

    • one year ago
  18. shaik0124
    Best Response
    You've already chosen the best response.
    Medals 1

    yes now answer is correct

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

    thanks alot (:

    • one year ago
  20. shaik0124
    Best Response
    You've already chosen the best response.
    Medals 1

    now u substitute x value in any equation u will get y value

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

    -4 (-26) + y = 6 104 + y = 6 y = 98

    • one year ago
  22. shaik0124
    Best Response
    You've already chosen the best response.
    Medals 1

    yes right answer

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

    savior <3

    • 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.