Identify Functions (Equations) Worksheet Template With Answer Key
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1
2Identify 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.
-2
no
1) y
2) x = 2 × y
= x × 6
1.
yes
2.
-4
3) x = 7 + y
4) y
yes
× 5 = x
3.
no
4.
1
5) y
6) 8y = x
yes
= 2 × x
5.
yes
6.
4
6
7) y
8) x × 9 = y
no
= 2 - x
7.
no
8.
6
9) x + 7 = y
10) y = 7 ÷ x
no
9.
yes
10.
-6
11) x = -5
12) y
÷ 5 = x
no
11.
no
12.
13) y = x × 8
14) y = 4 - x
yes
13.
yes
14.
8
-8
15) y
16) y
= 2 + x
= x
no
15.
no
16.
17) y = -3
18) y = x + 2
yes
17.
yes
18.
4
6
19) y
20) y
= 2 ÷ x
+ x = 7
no
19.
no
20.
1-10 95 90 85 80 75 70 65 60 55 50
Math
9
11-20 45 40 35 30 25 20 15 10 5
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