SOLUTION: I need help with everything that is about direct variation. example when they give you find x when y=50 when x=2 and y=200 I know for some you gotta use this form y1/(x1)2 = y1/(x2

Algebra ->  Graphs -> SOLUTION: I need help with everything that is about direct variation. example when they give you find x when y=50 when x=2 and y=200 I know for some you gotta use this form y1/(x1)2 = y1/(x2      Log On


   

Question 998806: I need help with everything that is about direct variation. example when they give you find x when y=50 when x=2 and y=200 I know for some you gotta use this form y1/(x1)2 = y1/(x2)2 and the other is just with out (2)
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Your description makes no sense. Try again. Maybe pick a well described example.

Variation can be either direct or inverse. Usually a variable like k is chosen as a variation constant.

Using variables x and y, you MIGHT want to use how y is related to x.

y varies directly with x.
This can be translated, highlight%28y=kx%29. If given a set of x & y values, you can find the value for k.
y%2Fx=kx%2Fx
highlight_green%28y%2Fx=k%29

y varies inversely with x.
The translation can be, highlight%28y=k%2Fx%29. If given a set of x & y values, you can find the value for k.
y%2Ax=%28k%2Fx%29%2Ax
highlight_green%28yx=k%29

Be aware that sometimes alternative wording is used, but you become accustomed to interpreting it.
The word, "jointly" may be used in place of "directly".