4.1 Review Worksheet (continued)
4.1.3 Writing Function Rules Determine a relationship between the x - and y -values. Write an equation. 14.
15. {(1, − 1), (2, − 2), (3, − 3), (4, − 4)}
x y
1 2 3 4
− 2
− 4
− 6
− 8
Evaluate each function for the given input values. 16. For f ( x ) = x 2 − 5, find f ( x ) when x = 0 and when x = 3.
17. For g ( x ) = x 2 + 6, find g ( x ) when x = 1 and when x = 2.
2 3 x + 3, find f ( x ) when x = 9 and when x = − 3.
18. For f ( x ) =
Identify the independent and dependent variables in each situation. 19. Gardeners buy fertilizer according to the size of a lawn.
20. The cost to gift wrap an order is $3 plus $1 per item wrapped.
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