Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

krissywatts

  • one year ago

ues substition method to fin solution sets: I need step by step help 2a+4b=-24 a=20-2b

  • This Question is Closed
  1. mathstudent55
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    In the substitution method, you first need to solve one equation for one variable. In this case, that step is already done because the second equation shows what a is equal to. In other words, the second equation is already soved for a.

  2. mathstudent55
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    The second step is to substitute the variable a in the first equation with what a is equal to in the second equation. Since a = 20 - 2b, everywhere you see a in the firtst equation, wrtite 20 - 2b

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

    i have a+b=-12 a+2b=20 is this correct?

  4. mathstudent55
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    No. The first equation is 2a + 4b = -24 Where you see a, write (20 - 2b) You should have no a's left there.

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

    i get -4 is this correct?

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

    as my finale answer

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

    for b

  8. mathstudent55
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    You ask for step by step help. I give you step by step help, but you skip a bunch of steps. You still haven't shown what you got after the substitution.

  9. mathstudent55
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    The first equation is 2a + 4b = -24 Where you see a, write (20 - 2b)

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

    i did

  11. mathstudent55
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Where is it then? It should look like this: 2a + 4b = -24 2(20 - 2b) + 4b = -24

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

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

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.