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Writing Functions
Practice Writing Functions
15
Mathematics
9th Grade
05/02/2011
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Term
Write the function that is shown by the following:
{(0,2), (1,3), (2,4), (3,5)}
 Definition
f(x) = x + 2
Term
Write the function that is shown by the following:
{(-2,-4), (-1,-2), (0,0), (1,2)}
 Definition
f(x) = 2x
Term

x

y

-1

2

0

1

1

0

 2

-1
Definition
f(x) = -x + 1
Term

x

y

-2

8

-1

4

2

-8

3

-12
Definition
f(x) = -4x
Term

x

y

-1

-5

0

-3

1

-1

2

1
Definition
f(x)= 2x - 3
Term

x

y

-4

1

0

2

4

3

8

4
Definition
f(x) = ¼x + 2
Term
Write an equation so that the y-value is triple the x-value.
 Definition
f(x) = 3x
Term
Write an equation so that the y-value is 3 less than the x-value.
 Definition
f(x) = x - 3
Term
Write an equation so that the y-value is 1 less than twice the x-value.
 Definition
f(x) = 2x - 1
Term
Jamie wants to order some DVDs online. They cost $12 each and the shipping is a flat rate of $6. Write an equation that gives the total cost. How much would it cost for 5 DVDs?
 Definition
f(x) = 12x + 6
$66
Term
Is the ordered pair a solution to the given equation? (3, -2) 4x - 2y = 6
 Definition
No
Term
Is the ordered pair a solution to the given equation? (-1,2) y = 2x + 4
 Definition
Yes
Term
Is the ordered pair a solution to the given equation? (0,-4) y = 2x - 4
 Definition
Yes
Term
Is the ordered pair a solution to the given equation? (-1,-1) x - y = -2
 Definition
No
Term
Is the ordered pair a solution to the given equation? (-2,3) 2x - 4y = 12
 Definition
No
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