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Direct vs. indirect variation. Direct variation. A linear relationship between two variables, written in the form Y=KX or K = Huh? What this means is the Y’s will be the X’s times the same number. Another short cut.
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Direct variation • A linear relationship between two variables, written in the form Y=KX or K= Huh? What this means is the Y’s will be the X’s times the same number
Another short cut • 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”
Example as table • Each X is multiplied by 3 to get the Y value
Example as equation • Y=3x • Y=1/2X • 2y=X because divide both sides by 2 resulting Y=1/2X
You try which examples are direct variation • Y=X+3 • (0,0)(1,6)(2,12) 3.
Inverse variation • 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.
Another short cut • If you multiple X and Y and they always equal the same constant • then it is an inverse variation
You try • This time you create a chart containing an inverse variation.