Find the constant of variation (k)
Write equation given y and x
Given 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

The biggest island in the world.

What is Greenland?
100

The number of bones in the body, plus or minus 5.

What is 206?

200
y=x/2 What is k?
1/2
200

The number of students at CHCH, plus or minus 2

174

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

In what year did Columbus sail the ocean blue?

What is 1492?

300
y=256 and x=4. Write the direct variation equation.
y=64x
300

The number of CHCH faculty, plus or minus 3

What is 72?

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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