A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

Help please! Solve 2a − 5d = 30 for d. Show your work.

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

    @peachpi

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

    You have to move the 2a to the other side. It's added to -5d, so what operation do you have to use?

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

    subtraction?

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

    right. so what do will you have after subtracting 2a from both sides of the equation?

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

    do i subtract 2a from 5d or 30?

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

    From the 30. It helps to line up like terms so you can see what cancel. |dw:1443035502144:dw|

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

    a - 5d = 28a ? sorry I'm terrible at this :/

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

    no worries. You can only combine terms with the same variable (aka like terms). So on the right side, you can't subtract 2 from the 30 because the 2 has an \(a\) and the 30 does not. So when you subtract, it's going to stay \(30-2a\). On the left side, you have two like terms \(2a\) and \(-2a\). When you subtract them you get \(0\). In the same way that \(2 - 2 = 0\), when you put variable there \(2a-2a=0\)|dw:1443036063501:dw|

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

    so now all that's left is to divide by -5 because it's mulitplied by d.

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

    |dw:1443036224256:dw|

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

    thank you so much!! @peachpi

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

    you're welcome

  13. 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.