Which of the following relations are functions? I.y = -x + 3 II.x = y + 3 III.x -y = 3 (2 points)

 

Which of the following relations are functions?

 

I.y = -x + 3
II.x = y + 3
III.x -y = 3 (2 points)
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1 Answer

Each is a function. I is a function in x, II is a function in y or can be rewritten as a function in x and III can also be written as a function in y or x. The reason is that each is a linear relation so has a one-to-one mapping.

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