A function is a relationship between input values and output values
wherein there is a unique output for each input.
If a function's input values are x-values and its output values
are y-values, then y can be referred to as a function of x.
Input | Output |
-4 | 2 |
-3 | -1 |
0 | 6 |
1 | 8 |
6 | 12 |
| |
Input | Output |
-4 | -2 |
-3 | -1 |
0 | 6 |
0 | 8 |
6 | 12 |
|
function | | not a function |
(-4, -8) (-2, 5) (0, 3) (2, -1) (4, -4) | | (-4, 8) (-2, 5) (0, 3) (-2, -1) (-4, -4) |
function | | not a function |
| | |
function | | not a function |