Making the x-axis intersect y-axis at zero

Hi,
I think this is probably a simple question but couldn't find it answered anywhere. Basically I have some data I want to plot on a graph which has some of the 'y values' as negative. I have tried to make a scatter chart which works, but it puts the x-axis at the bottom, rather than it still intersecting the y-axis at zero which is what I want. Seems like it should be simple as I guess this is a common request but I couldn't work out how to do it.
Thanks in advance,
Pierce

The closest I've been able to come is to not show the X-axis, show Y-axis grid lines, then choose 1 step for the Y-axis increments. The X-scale still remains at the bottom of the chart, though.

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Making the x-axis intersect y-axis at zero

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