SOLUTION: how do I find a proportion using points on a graph?

Question 652069: how do I find a proportion using points on a graph?
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
This is how you write a direct proportion. The symbol in the middle is the Greek letter alpha.

It reads: is directly proportional to .

It means: By whatever factor changes, changes by the same factor.
Here is an example of a point you can put on a graph. The point is (, ) and it has coordinates (, ).
Coordinates for second point (, ) are (, )
as we can see, changes by a factor of . That is, times a factor of equals , and
as we can see, changes by a factor of . That is, times a factor of equals
Therefore, is directly proportional to , .

Also, could be proportional to . It means: By whatever factor changes, changes by the of that factor. (Or you could say, �by the reciprocal of that factor�.)
in example above changes by factor ; so, changes by the of that factor which is .

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