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

MightySmurf Group Title

Solve this system of equations using the addition method? x-y=6 -3y=x+22 Solve this system of equations using the addition method? x-y=6 -3y=x+22 @Mathematics

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. VeryShy Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    y=-7 x=13

    • 2 years ago
  2. VeryShy Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    that true?

    • 2 years ago
  3. amistre64 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    scale the 1st by -3

    • 2 years ago
  4. amistre64 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    -3x +3y = -18 -3y = x+22 ---------------- -3x = x+4 -4x = 4

    • 2 years ago
  5. MightySmurf Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    how do you get x+4

    • 2 years ago
  6. amistre64 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    by using the "addition" method ... you add the 2 equations together after you modify one of them by a scalar

    • 2 years ago
  7. amistre64 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    a scalar just means some number that you multiply the whole equation by to scale it up or down to something that you can use

    • 2 years ago
  8. MightySmurf Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    o so i just substitute it

    • 2 years ago
  9. amistre64 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    well, substitution will work as well; but this is a new method for you to learn so that you have many ways you can attack a problem to get to a solution

    • 2 years ago
  10. amistre64 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    this "addition" method is also commonly refered to as "elimination" since the goal is to eliminate one of the variables

    • 2 years ago
  11. MightySmurf Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    o ok thank you u make it sound easier to solve

    • 2 years ago
  12. MightySmurf Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    so if i were to have -8x+3y=-5 and 8x-2y=6 i would add the _8x and the 8x to get zero then 3-2y to get y and -5+6 to get 1 right

    • 2 years ago
  13. amistre64 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    practice helps :) the steps are pretty much like this: x - y = 6 ; (1) -3y = x + 22 ; (2) given 2 equations lets multiply one of them by a "n"umber to scale it. the easiest one would be the first one to me n(x - y = 6) ; (1) -3y = x + 22 ; (2) nx - ny = 6n ; (1) -3y = x + 22 ; (2) now what does "n" have to be to get rid of the -3y? id say n = -3 will work -3x - -3y = 6(-3) ; (1) -3y = x + 22 ; (2) -3x +3y = -18 ; (1) -3y = x + 22 ; (2) now we can add the equations together: -3x +3y = -18 ; (1) -3y = x + 22 ; (2) ---------------------- -3x = x + 4 ; (3) and solve the new equation (3) for the remaining variable

    • 2 years ago
  14. amistre64 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    if they give you: -8x+3y =-5 8x-2y = 6 then yes the x parts are already set up for elimintion, just add the 2 equations together

    • 2 years ago
  15. MightySmurf Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    ok thank u sooo much i would give u thousands of medals if i could

    • 2 years ago
  16. amistre64 Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    youre welcome, and good luck ;)

    • 2 years 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.