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sws._.
Group Title
Christopher is 4 times as old as Michael. Ten years ago, Christopher was 9 times as old as Michael.How old is Christopher now?
 one year ago
 one year ago
sws._. Group Title
Christopher is 4 times as old as Michael. Ten years ago, Christopher was 9 times as old as Michael.How old is Christopher now?
 one year ago
 one year ago

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geoffb Group TitleBest ResponseYou've already chosen the best response.0
Are you able to turn the sentence into an equation?
 one year ago

sws._. Group TitleBest ResponseYou've already chosen the best response.0
i think that is what im supposed to do, but im having trouble setting it up
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
Okay, no problem. Do you have a guess as to how you would start?
 one year ago

sws._. Group TitleBest ResponseYou've already chosen the best response.0
4x10 is this one side of the equation?
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
Can you write an equation for right now? Let's say time = 0 right now.
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
Use C and M for your variables.
 one year ago

sws._. Group TitleBest ResponseYou've already chosen the best response.0
okay but how would i set it up?
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
"Christopher is 4 times as old as Michael." Write that algebraically.
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
What is 4M?
 one year ago

sws._. Group TitleBest ResponseYou've already chosen the best response.0
4 times michaels age
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
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
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
So how would you write a formula for "Christopher is 4 times as old as Michael?"
 one year ago

sws._. Group TitleBest ResponseYou've already chosen the best response.0
4m=10(4x9) ? i have no idea ._.
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
That's okay. Not to worry. It's C = 4M
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
Does that make sense?
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
That is a perfectly valid statement for right now. Now, the tougher part, you need to write a formula for 10 years ago.
 one year ago

sws._. Group TitleBest ResponseYou've already chosen the best response.0
oh okay i know that 10 has to be outside the parenthesis
 one year ago

sws._. Group TitleBest ResponseYou've already chosen the best response.0
does 9 go outside?
 one year ago

sws._. Group TitleBest ResponseYou've already chosen the best response.0
because it says 9 times as old as Christopher
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
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.
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
Yes, right! The 9 goes outside.
 one year ago

sws._. Group TitleBest ResponseYou've already chosen the best response.0
okay so it would be 9(x10) ?
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
Yes! But what is x?
 one year ago

sws._. Group TitleBest ResponseYou've already chosen the best response.0
i mean c. im using x instead of c
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
Remember, you need an equal sign, and stuff on both sides of it.
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
Okay, we can use x instead of C. But then what are we using instead of M?
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
Remember, for now, we are keeping their ages separate.
 one year ago

sws._. Group TitleBest ResponseYou've already chosen the best response.0
i guess we can use y or m but i like x instead of c
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
Sure. Okay, so in the formula I gave before, x = 4y Chris (x) is 4 times older than Michael (y) right now.
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
So now, we need to do our "10 years ago" formula.
 one year ago

sws._. Group TitleBest ResponseYou've already chosen the best response.0
would it be the one i mentioned before?
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
Yes, but you used x. It should be y.
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
And you need your full formula.
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
But you're doing great.
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.0
@sws._. Mention me if you feel like continuing. I'd like to help you learn this so you can do your other 11 questions.
 one year ago
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