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sws._.

  • 2 years ago

Christopher is 4 times as old as Michael. Ten years ago, Christopher was 9 times as old as Michael.How old is Christopher now?

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  1. geoffb
    • 2 years ago
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    Are you able to turn the sentence into an equation?

  2. sws._.
    • 2 years ago
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    yeah

  3. sws._.
    • 2 years ago
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    i think that is what im supposed to do, but im having trouble setting it up

  4. geoffb
    • 2 years ago
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    Okay, no problem. Do you have a guess as to how you would start?

  5. sws._.
    • 2 years ago
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    4x-10 is this one side of the equation?

  6. geoffb
    • 2 years ago
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    Can you write an equation for right now? Let's say time = 0 right now.

  7. sws._.
    • 2 years ago
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    yeah

  8. geoffb
    • 2 years ago
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    Use C and M for your variables.

  9. sws._.
    • 2 years ago
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    okay but how would i set it up?

  10. geoffb
    • 2 years ago
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    "Christopher is 4 times as old as Michael." Write that algebraically.

  11. sws._.
    • 2 years ago
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    4m ?

  12. geoffb
    • 2 years ago
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    What is 4M?

  13. sws._.
    • 2 years ago
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    4 times michaels age

  14. sws._.
    • 2 years ago
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    4 * M

  15. geoffb
    • 2 years ago
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    Right. But you need an equals sign and something on the other side. For example, if steak is 10 times heavier than rice, steak = 10 * rice, which as a formula would be S = 10R

  16. geoffb
    • 2 years ago
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    So how would you write a formula for "Christopher is 4 times as old as Michael?"

  17. sws._.
    • 2 years ago
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    4m=10(4x-9) ? i have no idea ._.

  18. geoffb
    • 2 years ago
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    That's okay. Not to worry. It's C = 4M

  19. geoffb
    • 2 years ago
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    Does that make sense?

  20. geoffb
    • 2 years ago
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    That is a perfectly valid statement for right now. Now, the tougher part, you need to write a formula for 10 years ago.

  21. sws._.
    • 2 years ago
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    oh okay i know that 10 has to be outside the parenthesis

  22. sws._.
    • 2 years ago
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    no wait..

  23. sws._.
    • 2 years ago
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    does 9 go outside?

  24. sws._.
    • 2 years ago
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    because it says 9 times as old as Christopher

  25. geoffb
    • 2 years ago
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    On the side where parentheses matter, the 10 will actually need to go inside. You need to write an equation for the second statement which uses the variables for their current ages. That might sound complex, but it's as simple as: My current age might be x. I can say that 10 years ago, my age was x - 10. It doesn't matter what x represents; x - 10 is valid no matter what.

  26. sws._.
    • 2 years ago
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    ohhh

  27. geoffb
    • 2 years ago
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    Yes, right! The 9 goes outside.

  28. sws._.
    • 2 years ago
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    okay so it would be 9(x-10) ?

  29. geoffb
    • 2 years ago
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    Yes! But what is x?

  30. sws._.
    • 2 years ago
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    i mean c. im using x instead of c

  31. geoffb
    • 2 years ago
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    Remember, you need an equal sign, and stuff on both sides of it.

  32. geoffb
    • 2 years ago
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    Okay, we can use x instead of C. But then what are we using instead of M?

  33. geoffb
    • 2 years ago
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    Remember, for now, we are keeping their ages separate.

  34. sws._.
    • 2 years ago
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    i guess we can use y or m but i like x instead of c

  35. geoffb
    • 2 years ago
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    Sure. Okay, so in the formula I gave before, x = 4y Chris (x) is 4 times older than Michael (y) right now.

  36. geoffb
    • 2 years ago
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    So now, we need to do our "10 years ago" formula.

  37. sws._.
    • 2 years ago
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    would it be the one i mentioned before?

  38. geoffb
    • 2 years ago
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    Yes, but you used x. It should be y.

  39. geoffb
    • 2 years ago
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    And you need your full formula.

  40. geoffb
    • 2 years ago
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    But you're doing great.

  41. geoffb
    • 2 years ago
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    @sws._. Mention me if you feel like continuing. I'd like to help you learn this so you can do your other 11 questions.

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