anonymous
  • anonymous
Christopher is 4 times as old as Michael. Ten years ago, Christopher was 9 times as old as Michael.How old is Christopher now?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
Are you able to turn the sentence into an equation?
anonymous
  • anonymous
yeah
anonymous
  • anonymous
i think that is what im supposed to do, but im having trouble setting it up

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anonymous
  • anonymous
Okay, no problem. Do you have a guess as to how you would start?
anonymous
  • anonymous
4x-10 is this one side of the equation?
anonymous
  • anonymous
Can you write an equation for right now? Let's say time = 0 right now.
anonymous
  • anonymous
yeah
anonymous
  • anonymous
Use C and M for your variables.
anonymous
  • anonymous
okay but how would i set it up?
anonymous
  • anonymous
"Christopher is 4 times as old as Michael." Write that algebraically.
anonymous
  • anonymous
4m ?
anonymous
  • anonymous
What is 4M?
anonymous
  • anonymous
4 times michaels age
anonymous
  • anonymous
4 * M
anonymous
  • anonymous
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
anonymous
  • anonymous
So how would you write a formula for "Christopher is 4 times as old as Michael?"
anonymous
  • anonymous
4m=10(4x-9) ? i have no idea ._.
anonymous
  • anonymous
That's okay. Not to worry. It's C = 4M
anonymous
  • anonymous
Does that make sense?
anonymous
  • anonymous
That is a perfectly valid statement for right now. Now, the tougher part, you need to write a formula for 10 years ago.
anonymous
  • anonymous
oh okay i know that 10 has to be outside the parenthesis
anonymous
  • anonymous
no wait..
anonymous
  • anonymous
does 9 go outside?
anonymous
  • anonymous
because it says 9 times as old as Christopher
anonymous
  • anonymous
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.
anonymous
  • anonymous
ohhh
anonymous
  • anonymous
Yes, right! The 9 goes outside.
anonymous
  • anonymous
okay so it would be 9(x-10) ?
anonymous
  • anonymous
Yes! But what is x?
anonymous
  • anonymous
i mean c. im using x instead of c
anonymous
  • anonymous
Remember, you need an equal sign, and stuff on both sides of it.
anonymous
  • anonymous
Okay, we can use x instead of C. But then what are we using instead of M?
anonymous
  • anonymous
Remember, for now, we are keeping their ages separate.
anonymous
  • anonymous
i guess we can use y or m but i like x instead of c
anonymous
  • anonymous
Sure. Okay, so in the formula I gave before, x = 4y Chris (x) is 4 times older than Michael (y) right now.
anonymous
  • anonymous
So now, we need to do our "10 years ago" formula.
anonymous
  • anonymous
would it be the one i mentioned before?
anonymous
  • anonymous
Yes, but you used x. It should be y.
anonymous
  • anonymous
And you need your full formula.
anonymous
  • anonymous
But you're doing great.
anonymous
  • anonymous
@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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