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Published byTariq Hurlock Modified over 2 years ago

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Direct variation

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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

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

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Example as graph

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

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

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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

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

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Example as graph

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x6212 y6183 Example as chart

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

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summary

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* Collect the like terms 1. 2a + 4 + 3 = 2a + 7 2. 8x -2x + 9 = 6x + 9 3. 7z – 8 + 2 – 5z = 2z - 6.

* Collect the like terms 1. 2a + 4 + 3 = 2a + 7 2. 8x -2x + 9 = 6x + 9 3. 7z – 8 + 2 – 5z = 2z - 6.

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