Functions Worksheet - Big Ideas Math Prealgebra: A Florida Standards Curriculum Teaching Edition Page 3
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47What You
Learned Before
(MAFS.5.OA.2.3)
Example 1
Find the missing value in the table.
x
y
Each y-value is 30 less than the x-value.
30
0
40
10
50
20
So, the missing value is 60 − 30 = 30.
60
Find the missing value in the table.
1.
2.
3.
x
y
x
y
x
y
5
10
0.5
1
15
5
7
14
1.5
2
30
10
10
20
3
3.5
45
15
40
9.5
60
Evaluating Algebraic Expressions
(MAFS.7.NS.1.3)
Evaluate 2x − 12 when x = 5.
Example 2
− 12 = 2(5) − 12
2x
Substitute 5 for x.
= 10 − 12
Using order of operations, multiply 2 and 5.
= 10 + (− 12)
Add the opposite of 12.
= − 2
Add.
Evaluate the expression when y = 4.
y
4. − 4y + 2
− 8
6. − 10 − 6y
—
5.
2
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