Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

aaronofcharsky

  • 2 years ago

Which value of x satisfies both -9x + 4y = 8 and -3x − y = 4?

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

    A. -1/7 B. -7/9 C. -8/7 D. -9 E. -4/3

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

    Plugin and see!

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

    Whats the answer?

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

    Multiply the second equation by 4: 4 * (-3x - y) = 4 * 4 -12x - 4y = 16 Now add the two equations together: -9x + 4y = 8 + -12x - 4y = 16 -21x + 0y = 24 x = 24/-21 x = -8/7 The answer is C.

  5. 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