#### Topic: A simple BP graph.

I am attempting to do the following :-

X-axis min 1 max 30 Tick 1 grid 1 x cross y at 60

Y-axis min 60 max 160 tick 10 grid 10 y cross x at 1

However the program seems to have a mind of its own, stretching the axes and adding unwanted negatives.

What am I doing incorrectly?

Thank you