 Direct variation

  If Y divided by X always gives you the same number then it is direct variation.  I remember this because direct and divide by start with “D” Another short cut

  Each X is multiplied by 3 to get the Y value Example as table X123 Y369

 Example as graph

  Y=3x  Y=1/2X  2y=X because divide both sides by 2 resulting Y=1/2X Example as equation

 1.Y=X+3 2.(0,0)(1,6)(2,12) 3. You try which examples are direct variation X123 Y456

  Relationship between two variable written Y= K/x Huh, again? If Y equals a constant divided by a given X, then it is an inverse variation. Inverse variation

  If you multiple X and Y and they always equal the same constant  then it is an inverse variation Another short cut

 Example as graph

 x6212 y6183 Example as chart

  This time you create a chart containing an inverse variation. You try

 summary