Vivian L. answered • 10/01/13

Tutor

3
(1)
Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACH

Hi Ricardo;

Function is normally identified as f(x), not fg(x). f(x)=y

But to go further in this matter...

Unfortunately. I cannot draw for you. However, consider a graph to be a giant plus sign, +. The line which goes from left-to-right is the x-axis. It is the horizontal axis. The line which goes up-and-down is the y-axis. It is vertical.

x-axis---horizontal

y-axis---vertical

Do you have graph paper? Graph paper is paper full of boxes, similar to this...

+++++++

+++++++

+++++++

+++++++

+++++++

Now consider the above to be a collection of boxes, with a giant + within it.

Let's say you need to find point 1,3. This is x,y. You will begin from the cross-hairs of the giant +. On the x-axis, you will move one box to the right. On the y-axis, you will move three boxes up. That is point 1,3.

+++|#++

+++|*++

+++|*++

-----------

+++|+++

+++|+++

+++|+++

Let's say you need to find point -6,0. You will begin from the cross-hairs of the giant +. On the x-axis, you will move six boxes to the left. On the y-axis, you will remain on the horizontal line and not move. That is point -6,0.

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

#******------------

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

Let's say you need to find point 5,-2. You will begin from the cross-hairs of the giant +. On the x-axis, you will move five boxes to the right. On the y-axis, you will move two boxes down. That is point 5,-2.

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

-------------*****---

++++++|++++*+

++++++|++++#+

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++#+

++++++|++++++

++++++|++++++

++++++|++++++

++++++|++++++

Of course, point 0,0 is the point of the cross-hairs of the giant +.

Does this help? If not, please let me know.