Excel scatter plot with two x series and one y series

My data consists of a y value and the two x values that can be used as inputs to a quadratic equation to give the y value. I'd like to plot them, ideally with separate colours for the positive and negative halves of the curve, on a scatter plot, but nothing I've tried has made more than half of it work at the same time. Here's my data:

22  7.773592453 0.226407547
50  7.464101615 0.535898385
75  7.16227766  0.83772234
80  7.098386677 0.901613323
100 6.828427125 1.171572875
140 6.19089023  1.80910977
175 5.414213562 2.585786438
200 4           4

How can I make this work?

Recent Questions...