Question

What is a function ?

Answer 1

Welcome to OpenStudy!

I'd recommend you look up "function" on the 'Net and / or in any printed reading matter you may have.

Briefly, a mathematical function is like a machine that takes an input (such as x=2), does something with it and produces an output (such as y=5). Often the inputs are restricted in some way. Also, the possible outputs might not include all real numbers.

Answer 2

2. y=2x-3 Can you describe the permissible inputs? The possible outputs?

Answer 3

NPUT (x) 0 1 2 3
OUTPUT (y) 3 ? ? ?

For x = 0, y = 2(0) + 3 = 3
For x = 1, y = 2(1) + 3 = ?
For x = 2, y = 2(2) + 3 = ?
For x = 3, y = 2(3) + 3 = ?