Find k

Find k

Write Direct Variation Equation Given y and x

Given Direct Variation Equation, Find x or y

Is it Direct?

Questions/Definitions

100

y=3x
What is k?

3

100

y=6 and x=3. Write the direct variation equation.

y=2x

100

If y=2x and x=4, what is y?

8

100

Is the following a direct variation function?
y=5x

yes

100

What is k called? (its name)

constant of variation

200

y=x/2
What is k?

1/2

200

y=42 and x=6. Write the direct variation equation.

y=7x

200

If y=.3x and x=10, what is y?

3

200

Is the following a direct variation function?
y=(1/2)x

yes

200

What is the y-intercept of a direct variation function?

0

300

y=4
x=2
What is k?

2

300

y=256 and x=4. Write the direct variation equation.

y=64x

300

If y=4x and y=8, what is x?

2

300

Is the following a direct variation function?
y=x+2

no

300

What is the slope of a direct variation function? (which variable)

k

400

y=100
x=5
What is k?

20

400

y=500 and x=25. Write the direct variation equation.

y=20x

400

If y=.5x and y=6, what is x?

12

400

Is the following a direct variation function?
y=2x-3

no

400

In a direct variation function, which variable is the dependent variable?

y

500

y=1/3
x=1/2
What is k?

2/3

500

y=1/4 and x=1/8. Write the direct variation equation.

y=2x

500

If y=(1/3)x and y=3, what is x?

9

500

y=x/3

yes

500

What number/value can k not equal/have?

0

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