A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 4 years ago

systems of equation: a-b=-2 -2a+b=7 (okay i get that we have to have a elimination method to solve it but how do we start it? if you know what i mean!)

  • This Question is Closed
  1. lgbasallote
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    just add the two equations...b gets canceled out -a = 9 a = -9 b = -7

  2. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so a-b=-2 9+(-7)+(-2) -2a+b=7 -2(9)+(-7)=2 ?????????

  3. lgbasallote
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    ^you misplaced the negative signs

  4. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    where???

  5. lgbasallote
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    hahahha :)) crazygirl2012....i'm very sorry but the answer I gave was wrong...i was substituting the values to the second equation and it wasn't becoming equal to 7 the correct answer is a = -5 b = -3 I am really really really sorry. Checking: (-5) - (-3) = -2 -5 + 3 = -2 -2 = -2 -2(-5) + (-3) = 7 10 -3 = 7 7 = 7 so you know your values are correct.

  6. anonymous
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Thanks

  7. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

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.