Identify Functions (Equations) Worksheet Template With Answer Key Page 4
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20Answer Key
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.
9
9
yes
1) 4y = x
2) y
= x
1.
yes
2.
8
3) y + 8 = x
4) y
yes
+ x = 3
3.
no
4.
-4
-8
5) y
6) y
no
= x - 6
× 8 = x
5.
no
6.
7) x = 9
8) y = 7
no
7.
yes
8.
-2
9) y
10) y = 2 + x
= x × 8
no
9.
yes
10.
6
11) y = x ÷ 2
12) x - 7 = y
yes
11.
no
12.
-8
13) y
14) x = -3
= x + 9
no
13.
no
14.
9
15) y
16) y × 9 = x
= 2 ÷ x
yes
15.
yes
16.
2
6
17) y = 5 × x
18) y
= x
yes
17.
no
18.
19) y = x - 4
20) x = 9 × y
yes
19.
yes
20.
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