SAT Math Help!!!!!!!!!!!!!!!!!!
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SAT Math Help!!!!!!!!!!!!!!!!!!

[From: ] [author: ] [Date: 11-05-07] [Hit: ]
If you make x bigger, say, x = 10, then y also gets bigger (in this case, y = 50).Indirectly proportional (which is sometimes called inversely proportional),......
What does it mean when X and Y are directly proportional or indirectly proportional?

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What is probably meant by directly proportional is that x and y grow "with each other". For example, in the equation y = 5x, when x =1, y = 5. If you make x bigger, say, x = 10, then y also gets bigger (in this case, y = 50).

Indirectly proportional (which is sometimes called inversely proportional), is just the opposite. For example, if y = 1/x, then if x = 2, then y = 1/2. If we make x bigger, like x = 4, then y = 1/4, so y is getting smaller. The numbers x and y are related, because they both appear in the equation (this is why they are called proportional), but they grow in different directions.
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