Melody

Max and min of what?

22-(+16)=22 - + 16 =22 - 16 = 6

It is the same as

10  -3  +3 = 10  +3  -3 = 

For a rate you need two units.

like

miles/ hour

or

words/page

You only have one unit ( cm ) so you cannot turn it inato a rate.      

I was already lookin when Chris answered so I am going to finish my answer too :)

I am going to let the train that is travelling at x km/hour be at point 0

and I am going to let the train that is travelling at -y km/hour be at  d

AT any point T in time  the trains will be at point  xT and  d-yT

They will be at the same point when  

xT=d-yT

xT+yT=d

T(x+y)=d

T=d/(x+y)

At this point in time the trains will be at  dx / (x+y)

It is easier to work out this formula by doing it with the numbers first.    

-------

Using the fromula for you situation

x=5   y=3   and d=100

100*5 / 8

=500/8

= 62.5 km from the x start point 

Just as Chris said :))

25 = 5^2      perhaps that is what you want :)

3/100 * 3998 =

1 - 2/7  -  3/5

That is assuming no one walks or rides a bike or .......

I looked at your answer and I was very impressed with the quality of your explanation.

Thank you.      

Unfortunately you made a small error near the end.

You only multiplied one side by -1        

The answer should be y>-6

I assume you want to "build " this graph?

I have done it here

https://www.desmos.com/calculator/l2soz8jbni

Click on the circles on the far right one at a time, to build you graph :))

f(x)=1/3l-xl+4