Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

samtab Group Title

Evaluate 2xy - m when x = -4, y = 3, and m = 6 please show your work i dont know how to do this and this is worth 10 percent of my grade if i fail i will fail math please help me:(

  • one year ago
  • one year ago

  • This Question is Closed
  1. whpalmer4 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    It is simple matching of numbers and letters, followed by arithmetic. \[x=-4\]\[y=3\]\[m=6\] Now take the equation and replace the letters with the corresponding numbers: \[2xy-m = 2(-4)(3)-(6)\] What does that equal?

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

    i dont get it can u please show exaple?

    • one year ago
  3. whpalmer4 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    I did. All you have to do is the arithmetic. What is 2*(-4)*3 - 6 ?

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

    -2?

    • one year ago
  5. whpalmer4 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    What is 2*(-4)?

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

    -2?

    • one year ago
  7. whpalmer4 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    What is 2*4?

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

    8?

    • one year ago
  9. whpalmer4 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Yes, 2*4 = 8. 2*(-4) = -8, because a positive number (2) times a negative number (-4) gives you a negative result (-8). A negative number times a negative number gives you a positive result, and of course a positive number times a positive number also gives you a positive result. So, we've gotten the first multiplication done: \[2*(-4)*3 - 6 = (-8)*3 - 6\] What is (-8) * 3?

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

    -22?

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

    i mean -24

    • one year ago
  12. whpalmer4 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Yes. What is -24 - 6?

    • one year ago
  13. samtab Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    -28

    • one year ago
  14. whpalmer4 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Try again...

    • one year ago
  15. whpalmer4 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    If you're at -24 on the number line, and you go 6 units to the left (subtracting 6 = moving 6 units to the left on the number line), where do you end up?

    • one year ago
  16. samtab Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    can u please just tell me this problem and teach me on the other one cuzz this is very importind and i need to put in befor 3:30:(

    • one year ago
  17. whpalmer4 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    -24 - 6 what is 24 + 6? -24 -6 is the same thing, with a - sign in front...

    • one year ago
  18. samtab Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    31

    • one year ago
  19. whpalmer4 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    4 + 6 = 10, doesn't it? So 24 + 6 = 20+10 = 30. Similarly, -24 - 6 = -30

    • one year ago
  20. samtab Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    so its -30?

    • one year ago
  21. samtab Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    ???

    • one year ago
  22. whpalmer4 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Yes...sorry, didn't notice you had responded.

    • one year ago
  23. samtab Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    now can u please right down the whole problmem in order done i wana see how it fully looks like

    • one year ago
  24. whpalmer4 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    \[x=-4\]\[y=3\]\[m=6\]First substitute in value of \(x\): \[2xy-m = 2(-4)y-m\]Now \(y\): \[2xy-m = 2(-4)(3) -m \]Now \(m\): \[2xy-m = 2(-4)(3) - (6)\]Do the arithmetic: \[2xy-m = 2(-4)(3)-(6) = (-8)(3)-6 = -24 - 6 = -30\]

    • one year ago
  25. malevolence19 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Before anything else you need to learn basic arithmetic, this is a elementary school skill. You should be able to add numbers under 100 together easily. For example: 58+12 = 70 70 - 30=40 39-11=28 11-12=-1 -2-45=-47 You NEED to be able to do this quickly and accurately. You can't add 24 and 6 and get 31... You need to think what 4+6 is...10! So how could the number end in 1? From there the problem is asking to make a simple substitution. If I have: a*b - c with a = 2, b = -3, and c = 4 then it's simply 2*(-3) - 4 = -6-4=-10. Apply this to your current problem and any similar problem.

    • one year ago
    • Attachments:

See more questions >>>

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.