THAT IS,
if you feel however messy,
let's draw graphs by your hand clearly.
Graphs show you a whole moving of values in one view.
So they are very helpful for you.
That is, you can easily catch many information of your problem's situations.
Let you imagine a situation you must explain all topics only by words with no figure.
I think you will clearly find that explaining with figures is very easy for you.
Who is saying, "I want to answer only formulas."?
It is very important for us to understand and to feel how values turn big or small,
and whether it is in a positive area or a negative area.
Formulas also surely show relations between matters in a problem correctly.
But it is only one of representation ways of a problem situation.
By viewing from different aspects,
let's understand them from the full bottom of your heart.
(Let's read 3. What are functions?)
For additional information to you,
if you imagine and compere two cases
for explaining every person's position and movings and those aims in team play sports,
one case is only by words, and another case is by figures,
I think you will fully understand values of explanations with figures.
Can you make plans of games with all your team members without figures?
(For example, for basketball games or succor games)
I am sure that you will lose without pictures or figures.
Then, in ordinary life,
you will certainly select more advantage choices for you, that is, to use figures.
So also in your study,
I recommend you to select more advantage ways
to understand your situation in your problem
with no hesitation.
