Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonnnn

  • 2 years ago

The triangle on the left has a perimeter of 14, the triangle on the right has a perimeter of 21. What are x and y? Show your steps. I could sit here and figure it out by guessing and substituting, but I'm assuming there is a formula to this, so help?

  • This Question is Closed
  1. anonnnn
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    1 Attachment
  2. jim_thompson5910
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    The left triangle has a perimeter of 14, so x+y+y = 14 x+2y = 14 solve for x to get x = -2y + 14

  3. jim_thompson5910
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    the triangle on the right has a perimeter of 21, so 3x+(5/4)y+(5/4)y = 21 12x+5y+5y = 84 ... multiply everything by the LCD 4 to clear out the fractions 12x+10y = 84 12(-2y+14) + 10y = 84 ... plug in x = -2y + 14 Now solve for y

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

    y = 6

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

    Do I plug that in back at the same equation where I plugged in the other, then solve for x?

  6. jim_thompson5910
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yes, you plug it into x = -2y + 14 to find x

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

    Thank you so much I've been working at this for hours!!

  8. 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.