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| Math Central | Quandaries & Queries |
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Subject: input - output table Question is make an input - output table for the function using the domain 0,1,2,3,4, y =x + 8 ? y =0.4x +3 ? |
Hi Richard,
I am going to use a different function, y = 2x - 5 and a different domain, -1, 0, 1, 2. First I set up an input-output table
| x (input) | y (output) |
|---|---|
| -1 | |
| 0 | |
| 1 | |
| 2 |
To find the output values substitute the input values (x values) into the expression. For example
if x = -1 then y = 2
(-1) - 5 = -2 -5 = -7 and
if x = 0 then y = 2
Continuing I get
| x (input) | y (output) |
|---|---|
| -1 | -7 |
| 0 | -5 |
| 1 | -3 |
| 2 | -1 |
The range of the function is the set of output values and hence
for the function y = 2x - 5 and domain -1, 0, 1, 2 the range is -7, -5, -3, -1.
Penny
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