Question

4.

Which of the following relations is a function?

A. {(5, –4), (–4, 5), (–5, 4), (4, –5)}

B. {(–7, 6), (6, –7), (–7, 9), (10, 3)}

C. {(2, –3), (–3, 2), (2, 3), (–2, 3)}

D. {(8, –5), (–5, 8), (–5, –8), (–8, 5)}

Answer 1

A. {(5, –4), (–4, 5), (–5, 4), (4, –5)}

Explanation:

Since there is one value of

y

for every value of

x

in

(

5

,

−

4

)

,

(

−

4

,

5

)

,

(

−

5

,

4

)

,

(

4

,

−

5

)

, this relation is a function.

The relation is a function.