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NathaliaMA13

  • one year ago

An unknown number y is 12 more than an unknown number x. The number y is also x less than 17. The equations to find x and y are shown below. y = x + 12 y = −x + 17 Which of the following statements is a correct step to find x and y? Multiply the equations to eliminate y. Write the points where the graphs of the equations intersect the x-axis. Write the points where the graphs of the equations intersect the y-axis. Add the equations to eliminate x.

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  1. NathaliaMA13
    • one year ago
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    @Michele_Laino Are you busy? can you please explain to me how I solve this?

  2. anonymous
    • one year ago
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    Add the equations to eliminate x.

  3. anonymous
    • one year ago
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    By eye ball, y = 29/2

  4. NathaliaMA13
    • one year ago
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    I understand now. Thanks so much @robtobey

  5. Michele_Laino
    • one year ago
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    If I add those equations, I get: \[\Large y + y = x + 12 - x + 17\] please simplify

  6. NathaliaMA13
    • one year ago
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    \[y ^{2} = 29/2 ?? \]

  7. Michele_Laino
    • one year ago
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    no, we have: \[\Large 2y = 29\] |dw:1433789390159:dw|

  8. NathaliaMA13
    • one year ago
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    Okay. but you don't divide any thing at all?

  9. Michele_Laino
    • one year ago
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    yes! I can divide by 2, so I get: y=29/2 |dw:1433789590713:dw|

  10. NathaliaMA13
    • one year ago
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    Okay, I'm starting to understand more simpler. Can you explain to me how to solve another question, please?

  11. Michele_Laino
    • one year ago
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    ok!

  12. NathaliaMA13
    • one year ago
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    In a different thread or on this one?

  13. Michele_Laino
    • one year ago
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    in this one :)

  14. NathaliaMA13
    • one year ago
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    Ok c: so I'm really getting confused on this question; although it's 8th grade math. it's still very difficult for me :c I tried, I promise I have...

  15. NathaliaMA13
    • one year ago
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    Betsey is 11 years older than Waldo. Betsey's age is 15 years less than three times Waldo's age. The system below models the relationship between Betsey's age (b) and Waldo's age (w): b = w + 11 b = 3w − 15 Which of the following methods is correct to find Betsey's and Waldo's age? Solve w + 11 = 3w − 15 to find the value of w. Solve b + 11 = 3b − 15 to find the value of b. Write the points where the graphs of the equations intersect the x-axis. Write the points where the graphs of the equations intersect the y-axis.

  16. Michele_Laino
    • one year ago
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    since those equations have the same left side, then we can write: \[\Large w + 11 = b = 3w - 15\] or: \[\Large w + 11 = 3w - 15\]

  17. NathaliaMA13
    • one year ago
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    OH. The substitution method..Yes.

  18. Michele_Laino
    • one year ago
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    that's right!

  19. NathaliaMA13
    • one year ago
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    But, hey..what value did It solve for? value w, or for value b?

  20. NathaliaMA13
    • one year ago
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    There's no value b in any of the answer. So i'm going for value w. lol

  21. Michele_Laino
    • one year ago
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    if we solve the last equation for w, we get: \[\Large 2w = 26\]

  22. NathaliaMA13
    • one year ago
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    Great. Thank you @Michele_Laino I want to give you a medal. But I gave a medal to @robtobey already ://

  23. Michele_Laino
    • one year ago
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    no worries! :)

  24. NathaliaMA13
    • one year ago
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    I undid it, because you gave better explanations. lol. Have a great day! :)

  25. Michele_Laino
    • one year ago
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    thanks!! :)

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