How can I change direction of Y-axe?

[#1]

Hello, all!
I have Line chart with some values. I want that Y-axe scale would be from 0 to 50, but downwards: Top=0, bottom=50.
Can I do it?

[#2]

How about reverse the sign of the Values so that its -50 to 0 and then format the number so that the - sign does not show?

[#3]

Good idea, thanks.
Pop-up text is right, but axes scale with "-" (