9.2.2 Functions and Their Inverses − Practice
1. Use the horizontal line test to identify the relation whose inverse is a function. ○ ○
y
y
5 4 3 2 1
5 4 3 2 1
2 3 4 5 x
2 3 4 5 x
–5 –4 –3 –2
– –1 1 –2 –3 –4 –5
1
–5 –4 –3 –2
– –1 1 –2 –3 –4 –5
1
○
○
y
y
5 4 3 2 1
5 4 3 2 1
2 3 4 5 x
2 3 4 5 x
–5 –4 –3 –2
– –1 1 –2 –3 –4 –5
1
–5 –4 –3 –2
– –1 1 –2 –3 –4 –5
1
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