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## anonymous one year ago I don't understand this and I would love to learn how to do this: Consider the function g: {(2, 7), (4, 9), (12, 19), (20, 27), (31, 38)} What is g (12)?

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1. zepdrix

|dw:1433576373863:dw|

2. zepdrix

|dw:1433576411940:dw|

3. zepdrix

You put the x value into the function, the y value comes out.

4. zepdrix

Do you see how that might work with the 12? the 12 is corresponding to x=12

5. anonymous

so for (2, 7) g would be 3.5?

6. zepdrix

No, it's not g times 2. function notation takes a little getting used to I guess :) hehe. It's the function g, at a specific moment in time or place. The 2 is connected to the g in that way. so we would say that g of 2 equals 7. g=7 for that particular x value

7. anonymous

ooh I always thought of it as times xD sorry so G would be 2 at a certain time and would that would equal 7?

8. zepdrix

yes, at a certain place, x=2, g=7.

9. zepdrix

you put 2 INTO the g function and 7 comes out.

10. zepdrix

|dw:1433576698134:dw|

11. anonymous

omg soo much clearer now xD so I need to find what goes into g that comes out 12?

12. zepdrix

The first value in the coordinate pair is always the value going IN

13. anonymous

so ima give it a shot, please correct me if im wrong lol, The answer is 7? 7 goes into g to make 12?

14. zepdrix

|dw:1433576795658:dw|

15. anonymous

ok before I answer, does the function provide the answer? like (12,19)

16. zepdrix

yes, the ordered pair is written like this, (input, output)

17. anonymous

ooh ok so it is 19?

18. zepdrix

ok good job \c:/ so when x=12 goes INTO the function g(x), then 19 comes OUT of it. so therefore g(12) = 19

19. anonymous

omg awesome thank you! :D

20. zepdrix

np! Oh and, $$\Large\bf \color{#008353}{\text{Welcome to OpenStudy! :)}}$$

21. anonymous

Thank you :)

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