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Bellringer

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Bellringer Write and equation for each graph

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5-5 Direct Variation

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**Direct Variation A function in the form ,where**

, is a direct variation. The constant of variation, , is the coefficient of The variables and are said to vary directly with each other.

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**Is it direct variation? To discover this, just solve for y.**

Find the constant of variation

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**Is it direct variation? Try these please.**

Remember: To discover this, just solve for y. yes no no

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**Write the equation from a point**

Given point: (4, -3)

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**Write the equation from a point**

Your turn! Point (-3, -6) Point (12, -8)

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**Direct Variation Tables**

Use the ratio, , to tell whether y varies directly with x. Why? Since, k = If yes, then write the direct variation equation. x y -2 1 4 8 -4 -10 5

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Assignment Page 264 Numbers: even

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Direct Variation Equation for direct variation:. Page 6 Steps: 1.Set up a proportion 2.Cross multiply and solve for variable Since x varies directly as.

Direct Variation Equation for direct variation:. Page 6 Steps: 1.Set up a proportion 2.Cross multiply and solve for variable Since x varies directly as.

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