## pooja195 2 years ago does anyone know how to do a inout and output table with a rule

1. saifoo.khan

Input and outputs as in functions?

2. pooja195

yea

3. saifoo.khan

Do you have any specific problem?

4. pooja195

yea the top starts from -2 and goes to 2 and the bottom is blank

5. saifoo.khan

And the function/rule is?

6. pooja195

y=-20x

7. saifoo.khan

Perfect. now insert the values in place of "x" one by one. Let's say -2, -1, 0, 1, 2.

8. pooja195

what do you mean??

9. saifoo.khan

y = -20x is the function, right? insert the values one by one. y = -20(-2) y = output Then -1 y = -20(-1) y = output And so on..

10. pooja195

i dont get this

11. saifoo.khan

Why? Which part?

12. pooja195

how would you insert values?

13. saifoo.khan

Replace "x" with a value is inserting the value.

14. pooja195

so how would i use that in a function table

15. saifoo.khan

Those will give you certain values of "y". The values of "y" are the outputs.

16. PhoenixFire

A function is usually written like f(x)=rule. So for you equation y=-20x, you can see this as a function by changing it to f(x)=-20x where x in an input value into the function. If you want to find the value of that function at -2, you would write f(-2)=-20(-2)=40. Now you have a point at x=-2 and y=40. So you put that in your table. Then you go and do each other value of x from your input column.

17. pooja195

ok? y makes more sense ok so the what would be after that

18. saifoo.khan

Insert the resulted value in the table. Simple as that.

19. PhoenixFire

|dw:1358631840798:dw|

20. PhoenixFire

The resulting value from your function y=-20x is an output. 'y' IS an output. 'x' IS an input. Take your input 'x' from your table and put it into your function... calculate the function to get your 'y' output.