line graph - abrupt/sharp decrease?

[vizakenjack]

Alright, so imagine there are y values - speed: 10, 0, 10, 10
and corresponding x values - time in seconds: 0, 20, 40, 50

Now, how can I show that at the 11th second it suddenly stops, then after 2 seconds continues with the speed of 40?
So I want the line to go vertically downward.
I tried doing like this:
x values: 0, 10, 11, 20, 40, 50
y values: 10, 10, 0, 10, 10, 10

but it didn't work, x ticks are still the same, even though the distance between the y's 10 and 11 is smaller than between 11 and 20.

So I guess one way to make this work is to decrease tick mark on the x between 10 and 11's y value, and keep the remaining tick marks intact, how?

 

[ndsutherland]

If you are wanting to graph this data, use an xy scatter chart rather than a line graph.

 

[vizakenjack]

But still, I'm curious, how to decrease x tick mark between certain x points only?

Like, if your x tick marks are separated by 20, then 6.9 and 7 would be at the same distance as 40 and 60.
wtf