# 9.1 Inverse Variation & 2.3 Direct Variation

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9.1 Inverse Variation & 2.3 Direct Variation. Inverse Variation. So k = xy ‘k’ is the constant of variation. Direct Variation. a linear equation in the form y = kx where k cannot = 0 K =. Ex. Direct, inverse, or neither?. Ex. Direct, inverse, or neither?. Ex. - PowerPoint PPT Presentation

### Text of 9.1 Inverse Variation & 2.3 Direct Variation

• 9.1 Inverse Variation& 2.3 Direct Variation

• Inverse Variation

So k = xy

k is the constant of variation

• Direct Variationa linear equation in the form y = kx where k cannot = 0

K =

• Ex Direct, inverse, or neither?

xy30.760.35210.1

• Ex Direct, inverse, or neither?

xy-26-1.357-4

• Ex Direct, inverse or neither?

xy-254-106-15

• Ex Suppose that x and y vary inversely. If x = 7 and y = 4, write a function.

• Are these direct variations?

3y = 7x + 7

5x = 2y

• Ex A dripping faucet wastes a cup of water if it drips for three minutes. The amount of water wasted varies directly with the amount of time the faucet drips. Write an equation.

How long must it drip to waste 4.5 cups?

• Combined variationy varies directly with the square of x: y = kx2y varies inversely with the cube of x: y = k/x3z varies jointly with x and y and inversely with w: z = kxy/wz varies directly with x and inversely with the product of w and y: z = kx/wy

• Ex Mass m of a moving object is related to its kinetic energy k and its velocity v by m = 2k/v2. Describe the relationship using combined variation.

• Ex Describe using combined variation:

• EXZ varies directly as x and inversely as the square of y. When x = 35, y = 7, and z = 50, write a function and find z when x = 5 and y = 10.

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