Identify Functions (Equations) Worksheet Template With Answer Key Page 9

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Identify Functions (Equations)
Name:
Determine if each equation describes a function (yes) or not (no). In the eqation x
A n s w e r s
represents the input and y represents the output.
4
yes
1) y = x - 2
2) y
= 2 + x
1.
no
2.
3
1
3) y
4) y
yes
= 2 ÷ x
= 2 - x
3.
yes
4.
-2
5) y
6) y = x × 6
no
= x - 6
5.
yes
6.
7
6
7) y
8) y = x ÷ 7
yes
= x
7.
yes
8.
2
9) x = 7 ÷ y
10) x - 7 = y
yes
9.
no
10.
2
11) x × 2 = y
12) y = 7 × x
no
11.
yes
12.
-8
-8
13) y
14) y
= 7x
= x
no
13.
no
14.
15) 4y = 4x
16) y ÷ 6 = x
yes
15.
yes
16.
-6
-4
17) y
18) y
× 4 = x
= x + 7
no
17.
no
18.
8
19) y = -5
20) y
= 2 - x
yes
19.
no
20.
1-10 95 90 85 80 75 70 65 60 55 50
Math
5
11-20 45 40 35 30 25 20 15 10 5
0

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