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Grade 5 - Mathematics
13.3 Functions and Equations

  1. A function is a relation.
  2. It relates each of its inputs to exactly one output.
  3. f(x) = (2*x - 2) is an example for a function.
Example: f(x) = x + 2 is a function. What is the value of the function for x = 7
Substitute 7 for x
f(5) = 7 + 2 = 9
Answer: 9

Example: f(x) = (5*x +2) is a function. What is the value of the function for x = 5
Substitute 5 for x
f(5) = (5 * 5 + 2)
Answer: 27


Directions: Answer the following questions. Also write at least 5 examples of your own.
Q 1: f(x) = x + 5 is a function. What is the value of the function for x=7
7
Unknown
5
12

Q 2: f(x) = x/3 is a function. What is the value of the function for x=12
4
36
3
12

Q 3: y = x/2 is an equation. What is the value of y for x=4?
Cannot be solved
4
6
2

Q 4: y = x + 2 is an equation. What is the value of y for x=3?
5
3
2
Cannot be solved

Q 5: f(x) = (3*x - 2) is a function. What is the value of the function for x=2
4
3
2
6

Q 6: Which of the following are NOT inverse operations?
Squares and Square Roots
Addition and Subtraction
Multiplication and Addition
Multiplication and Division

Q 7: Opposite operations are also called inverse operations.
False
True

Q 8: y = (2*x + 1) is an equation. What is the value of y for x=1?
3
Unknown
2
1

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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