Super Easy Math Problem! (though, I can't solve it)

I am r4ymond · Apr 1, 2011

The problem is;

"If y varies directly as x and y = 14 when x = 8, find x and y = 21."

I can solve this problem, but it's just that I'm having a LOT of debate with my friends upon checking this answer. So what I'm trying to say is, is it 147/4 or 16/3?

This is a problem from my math wksts for homework (in which the math wksts will be worth a quiz grade, so I have to take advantage of this opportunity to raise my grade).

Thanks

KingdomBlade · Apr 1, 2011

y=kx
14=k8
divide both sides by 8, turns into 7/4

21=7/4x
divide all by 7/4
comes up as 144/7
equal to 12.

The poster above me is right.

I am r4ymond · Apr 1, 2011

This is rather confusing, for the formula that I use to solve this problem is xy=k then divide k by 21. I appreciate the answers

.

I'll wait for more answers to this question until tomorrow morning.

KingdomBlade · Apr 1, 2011

There are only 3 formulas for direct variation: y=kx, y/x=k, and y/k=x, I'm pretty sure of that. We studied this formula repeatedly, believe me.

KingdomBlade · Apr 1, 2011

Just in case you need more clarification.

http://www.cliffsnotes.com/study_gu...ion.topicArticleId-38949,articleId-38907.html

CrimzonEyed · Apr 1, 2011

Meh i use google for my math problems

http://www.blurtit.com/q4758482.html

I am r4ymond · Apr 1, 2011

Went through the answers today and it was indeed 12. Luckily I switched before I went over it.

Thanks for the help

Super Easy Math Problem! (though, I can't solve it)

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