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2-3 Direct Variations

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**Direct Variation: y = kx**

y varies directly with x y varies directly as x k = constant of variation = slope The graph of a direct variation ALWAYS goes through (0,0), the origin K is never 0. K can be positive or negative.

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**Direct Variation or not?**

Solve for y Put the equation in the form y = kx Does y vary directly with x? If so, find k. 2x – 3y = 1 2x – 3y = 0

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3. ½ x + 1/3y = 0 4. 7y = 2x 5. 3y + 4x = 8

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**Write and solve a direct variation**

Use the given x and y values to find k. Rewrite your equation with the value for k and the x and y variables.

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**Write a Direct Variation Equation**

Suppose y varies directly as x, and y = 9 when x = -3. Use the direct variation equation to find x when y = 15.

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**If y = 2 2/3 when x = ¼ ,find y when**

If y =4 when x =12, find y when x = -24

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**Data Tables y = kx also equals y/x = k**

If k (constant of variation) is the same for each y divided by x, then you have a direct variation.

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**Determine if each data table represents a direct variation**

Determine if each data table represents a direct variation. If so, write the equation. X Y -2 3.2 1 2.4 4 1.6

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X Y 4 6 8 12 10 15

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X Y -2 1 2 -1 4

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X Y -1 2 1 -4

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**Write the direct variation equation that goes through each point.**

Use (x,y) in y=kx. Find k, write your equation. 1) (1,2) 2) ( -3, 14)

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Direct Variation Section 1.9.

Direct Variation Section 1.9.

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